Hittite is the oldest attested Indo-European language and therefore of paramount importance for comparative Indo-European linguistics.
Categories
- Accounting (1094)
- General Accounting (714)
- International Accounting (403)
- Agriculture (1159)
- Agronomy (82)
- Bacteriology (77)
- Crop Science (86)
- Food Science (574)
- Horticulture (106)
- Soil Science (76)
- Sustainable Agriculture (22)
- Architecture (559)
- Astronomy & Space (1964)
- Aeronautics & Astronautics (370)
- Astronomy (1242)
- Astrophysics & Space Science (1008)
- Comets, Meteors & Asteroids (74)
- Cosmology (453)
- Mars (21)
- Solar System (76)
- Star-Gazing (137)
- Biographies & Memoirs (921)
- African-American & Black (31)
- Authors (57)
- Composers & Musicians (29)
- Educators (11)
- Entertainers (44)
- Irish (68)
- Jewish (22)
- Memoirs (84)
- Philosophers (43)
- Political (69)
- Presidents & Heads of State (32)
- Reference & Collections (35)
- Religious (51)
- Scientists (170)
- Social Scientists & Psychologists (20)
- Women (45)
- Biology & Life Sciences (4908)
- Anatomy & Physiology (345)
- Animals (406)
- Butterflies (14)
- Fish & Sharks (86)
- Fossils (30)
- Insects & Spiders (33)
- Mammals (133)
- Reptiles & Amphibians (33)
- Wildlife (70)
- Bioinformatics (484)
- Biology (3167)
- Cell Biology (970)
- Developmental Biology (207)
- Entomology (139)
- Molecular Biology (1441)
- Biophysics (363)
- Botany (431)
- Ecology (543)
- Paleontology (56)
- Paleozoology (10)
- Vertebrate (17)
- Plants (131)
- Flowers (88)
- Zoology (530)
- Animal Behavior & Communication (24)
- Ichthyology (30)
- Invertebrates (55)
- Ornithology (42)
- Primatology (22)
- Books For Teens (429)
- Health, Mind & Body (26)
- Drug & Alcohol Abuse (26)
- Literature & Fiction (23)
- Science & Technology (124)
- Computers (37)
- Earth Science (87)
- Health, Mind & Body (26)
- Business (6468)
- Business Communication (72)
- Business Development (228)
- Human Resources (154)
- International Business (266)
- Investments & Securities (340)
- Management & Leadership (3096)
- Consolidation & Merger (38)
- Decision-Making & Problem Solving (190)
- Industrial (117)
- Leadership (436)
- Management (594)
- Management Science (1620)
- Motivational (314)
- Negotiating (46)
- Operations Research (405)
- Planning & Forecasting (49)
- Pricing (42)
- Production & Operations (238)
- Quality Control (171)
- Strategy & Competition (49)
- Systems & Planning (323)
- Teams (23)
- Total Quality Management (97)
- Training (85)
- Marketing & Sales (485)
- Advertising (179)
- Consumer Behavior (81)
- Marketing (77)
- Direct (13)
- Global (26)
- Multilevel (14)
- Product Management (27)
- Public Relations (65)
- Organizational Behavior (123)
- Organizational Change (49)
- Workplace (60)
- Real Estate (132)
- Buying & Selling Homes (19)
- Investments (54)
- Mortgages (17)
- Sales (19)
- Careers & Job Hunting (2525)
- Guides (384)
- Industries & Professions (2000)
- Banks & Banking (187)
- Consulting (48)
- Customer Service (86)
- E-commerce (45)
- High-Tech (50)
- Hospitality, Travel & Tourism (71)
- Human Resources & Personnel Management (444)
- Industrial Relations (48)
- Insurance & Risk Management (54)
- MIS (590)
- Nonprofit Organizations & Charities (62)
- Oil & Energy (80)
- Purchasing & Buying (52)
- Retailing (65)
- Sports & Entertainment (67)
- Transportation (64)
- Interviewing (48)
- Job Hunting (179)
- Job Markets & Advice (16)
- Resumes (74)
- Vocational Guidance (117)
- Chemistry (2990)
- Analytic (798)
- Chromatography (70)
- Crystallography (229)
- Industrial & Technical (917)
- Inorganic (398)
- Molecular Chemistry (34)
- Nuclear Chemistry (78)
- Organic (170)
- Organometallic Compounds (99)
- Reactions (14)
- Synthesis (62)
- Physical & Theoretical (1033)
- Electrochemistry (137)
- Physical Chemistry (767)
- Quantum Chemistry (152)
- Polymers & Macromolecules (107)
- Safety (29)
- Children's Books (780)
- Ages 4-8 (31)
- Arts & Music (67)
- History & Historical Fiction (101)
- Military & Wars (41)
- People & Places (275)
- Biographies (97)
- Science & Technology (97)
- Careers (24)
- Explore the World (58)
- Biographies (97)
- Reference & Nonfiction (116)
- Law & Crime (19)
- Science Fiction, Fantasy & Horror (28)
- Science, Nature & How It Works (178)
- Astronomy & Space (18)
- Aeronautics & Space (18)
- Environment & Ecology (32)
- Health (17)
- Nature (41)
- Astronomy & Space (18)
- Sports & Activities (49)
- Activity Books (15)
- Coloring Books (15)
- Activity Books (15)
- Computer Science (11855)
- Algorithms (250)
- Artificial Intelligence (2144)
- Artificial Life (117)
- Cognitive Simulation (24)
- Computer Mathematics (189)
- Computer Vision (41)
- Cybernetics (7)
- Heuristic & Constrained Search (54)
- Machine Learning (266)
- Neural Networks (329)
- Robotics (414)
- Theory of Computing (862)
- Database Storage & Design (655)
- Graphics & Visualization (789)
- Human-Computer Interaction (15)
- Information Theory (442)
- Modeling & Simulation (507)
- Networking (3159)
- Intranets & Extranets (189)
- Network Administration (309)
- Network Programming (60)
- Network Security (939)
- Telephony (135)
- Wireless Networks (500)
- Object-Oriented Software Design (259)
- Operating Systems (1653)
- BSD (20)
- MacOS (257)
- Solaris (38)
- Unix (131)
- Windows OS (852)
- Programming Languages (2238)
- Software Design & Engineering (1384)
- Systems Analysis & Design (633)
- Computers & Internet (15584)
- Apple (166)
- Cocoa (20)
- Mac Administration (17)
- Mac OS X (81)
- Databases (679)
- Beginning & Introductory (23)
- Data Mining (114)
- Data Warehousing (11)
- Database Design (149)
- Database Management Systems (18)
- MySQL & mSQL (27)
- Relational Databases (193)
- Graphic Design (1032)
- 3D Graphics (349)
- Adobe InDesign (15)
- CAD (361)
- Information Visualization (11)
- Printing (53)
- Rendering & Ray Tracing (24)
- Hardware (1648)
- Design & Architecture (501)
- Handheld & Mobile Devices (155)
- Internet & Networking (190)
- Macs (125)
- Maintenance, Repair & Upgrading (54)
- Microprocessors & System Design (359)
- Embedded Systems (221)
- Microprocessor Design (86)
- PIC Microcontroller (28)
- Parallel Processing Computers (139)
- PCs (420)
- Home Computing (820)
- Games & Strategy Guides (148)
- Internet Games (18)
- Video Games (99)
- Introductory (401)
- Games & Strategy Guides (148)
- IT Business & IT Culture (2164)
- Biographies (97)
- Blogging & Blogs (58)
- Culture (321)
- Digital Law (50)
- eBay (47)
- Future of Computing (20)
- Hacking (272)
- Manager's Guides to Computing (838)
- Privacy (701)
- Technical Support (40)
- Web Marketing (83)
- IT Certification Central (1596)
- A+ (34)
- CCIE (36)
- CCNA (45)
- CCNP (26)
- CCSP (17)
- Cisco (299)
- CISSP (17)
- Exchange Server (20)
- Java (51)
- Linux (21)
- MCSE (165)
- Microsoft Press (93)
- MS SQL Server (38)
- Network+ (19)
- Oracle (169)
- Osborne-McGraw-Hill (107)
- PMP (18)
- Security+ (624)
- Sun Professional Certifications (17)
- Sybex (176)
- Microsoft (1145)
- Applications (261)
- Excel (139)
- Office 2000 (13)
- Outlook (41)
- PowerPoint (24)
- Word (37)
- Development (737)
- .NET (236)
- C & C++ Windows Programming (265)
- SQL Server (165)
- VBA (78)
- Scheduling & E-mail (85)
- Spreadsheets (14)
- Web Publishing (14)
- Word Processing (119)
- Applications (261)
- Mobile & Wireless Computing (166)
- Programming (7039)
- Algorithms (658)
- Cryptography (351)
- Data Structures (39)
- Digital Image Processing (117)
- Genetic (127)
- Memory Management (25)
- C (98)
- Cross-platform Development (11)
- Functional (20)
- Game Programming (394)
- Graphics & Multimedia (324)
- Languages & Tools (2743)
- Ajax (100)
- Assembly Language Programming (35)
- Borland Delphi (26)
- C# (357)
- Compiler Design (75)
- Compilers (137)
- CSS (78)
- Lisp (21)
- Python (90)
- Visual Basic (317)
- XHTML (54)
- XML (226)
- Software Design, Testing & Engineering (4205)
- Coding Theory (30)
- Object-Oriented Design (984)
- Software Development (3352)
- Software Reuse (15)
- Testing (365)
- UML (175)
- Algorithms (658)
- Project Management (364)
- Security & Encryption (1052)
- Software Engineering (1318)
- Design Tools & Techniques (224)
- Information Systems (642)
- Methodology (367)
- Multimedia Information Systems (130)
- Web Development (1748)
- Content Management (14)
- Web 2.0 (35)
- Web Design (331)
- Dreamweaver (67)
- Flash (138)
- Web Services (911)
- Website Architecture & Usability (457)
- Apple (166)
- Cooking & Food (568)
- Baking (58)
- Canning & Preserving (45)
- Diets & Healthy Food (68)
- Drinks & Beverages & Winemaking (102)
- Gastronomy (54)
- Earth Sciences (3022)
- Cartography (37)
- Earthquakes & Volcanoes (34)
- Environmental Science (1504)
- Geochemistry (84)
- Geography (340)
- Regional (243)
- Geology (256)
- Volcanology (47)
- Geophysics (443)
- Natural Disasters (29)
- Rivers (411)
- Seismology (100)
- Economics (628)
- Economic Theory (180)
- Macroeconomics (158)
- Education (679)
- Administration (26)
- Counseling (72)
- Curriculum & Instruction (28)
- Educational Philosophy (31)
- Elementary Education (40)
- Secondary Education (16)
- Special Education (21)
- Engineering (6949)
- Aeronautical Engineering (217)
- Chemical Engineering (1040)
- Civil Engineering (554)
- Electrical & Electronic Engineering (1460)
- Environmental Engineering (456)
- Industrial Engineering (461)
- Mechanical Engineering (1241)
- Nuclear Engineering (33)
- Entrepreneurship (1728)
- Biography & History & Company Profiles (159)
- Business Life (202)
- Business Ethics (126)
- Etiquette (15)
- Health & Stress (10)
- Motivation & Self-Improvement (24)
- Home Based (23)
- Legal Guides (14)
- Marketing (123)
- New Business Enterprises (90)
- Raising Capital (26)
- Skills (498)
- Business Writing (24)
- Communications (353)
- Office Automation (11)
- Running Meetings & Presentations (56)
- Secretarial Aids & Training (13)
- Time Management (31)
- Evolution (302)
- Organic (188)
- Finance (1093)
- Corporate Finance (238)
- Foreign Exchange (87)
- For Dummies (237)
- Format (99873)
- 7z (8)
- avi (3)
- bu (1)
- cbz (1)
- chm (4884)
- diz (70)
- djv (18)
- djvu (20534)
- doc (117)
- docx (3)
- dvi.gz (4)
- epub (5)
- exe (5)
- facto (1)
- fb2 (1)
- gz (68)
- hlp (2)
- htm (3)
- html (1)
- html.gz (1)
- iso (24)
- jpg (14)
- lit (25)
- mdi (1)
- mht (2)
- mp3 (6)
- nrg (4)
- p (1)
- pd (1)
- pdb (111)
- pdf (79498)
- pdf.gz (8)
- ppt (2)
- ps (17)
- ps.gz (41)
- rar (2065)
- rtf (24)
- sfv (1)
- tar (4)
- tar.gz (1)
- tex.gz (1)
- tgz (2)
- txt (69)
- wmv (2)
- zi (1)
- zip (283)
- Health, Mind & Body (2645)
- Death & Grief (28)
- Diets & Weight Loss (100)
- Disorders & Diseases (407)
- Allergies (32)
- Cancer (77)
- Epilepsy (24)
- Heart Disease (16)
- Multiple Sclerosis (30)
- Musculoskeletal Diseases (21)
- Nervous System (28)
- Osteoporosis (17)
- Pain Management (35)
- Sleep Disorders (19)
- Strokes (21)
- Health Reference (49)
- Mental Health (318)
- Abuse & Self Defense (20)
- Anxiety Disorders (31)
- Compulsive Behavior (60)
- Depression (42)
- Emotions (98)
- Manic Depression (13)
- Mood Disorders (19)
- Personality Disorders (29)
- Post-traumatic Stress Disorder (25)
- Schizophrenia (18)
- Personal Health (184)
- Children's Health (30)
- Healthy Living (81)
- Women's Health (44)
- Recovery & Rehab (116)
- Self-Help (612)
- Creativity (30)
- Dreams (13)
- Eating Disorders (22)
- Happiness (40)
- Memory Improvement (28)
- New Age (75)
- Personal Transformation (193)
- Self-Esteem (33)
- Spiritual (29)
- Stress Management (29)
- Success (171)
- History (6562)
- Africa (21)
- Angola (2)
- Nigeria (1)
- South Africa (19)
- Americas (167)
- Caribbean & West Indies (21)
- Mexico (37)
- South America (49)
- Ancient (990)
- Africa (125)
- Assyria, Babylonia & Sumer (28)
- China (33)
- Early Civilization (85)
- Egypt (101)
- Greece (198)
- Mayan (22)
- Rome (247)
- Asia (509)
- Afghanistan (18)
- Central Asia (23)
- Indonesia (11)
- Japan (107)
- Southeast Asia (50)
- Tibet (17)
- Turkey (63)
- Australia & Oceania (45)
- Europe (1540)
- Historical Study (574)
- Civilization & Culture (27)
- Essays (14)
- Historiography (87)
- History of Ideas (233)
- Revolutionary (35)
- Social History (183)
- Latin America (67)
- Middle East (313)
- Military (2576)
- Aviation (491)
- Canada (41)
- Intelligence & Espionage (28)
- Iraq War (35)
- Life & Institutions (117)
- Napoleonic Wars (71)
- Naval (173)
- Pictorials (45)
- Regiments (47)
- Strategy (142)
- Uniforms (50)
- United States (864)
- Vietnam War (60)
- Weapons & Warfare (134)
- World War I (168)
- Military Science (1269)
- Russia (233)
- World (796)
- Africa (21)
- Home & Garden (1149)
- Animal Care & Pets (59)
- Fish & Aquariums (25)
- Antiques & Collectibles (55)
- Bottles (9)
- Coins & Medals (29)
- Firearms & Weapons (17)
- Crafts & Hobbies (12)
- How-to & Home Improvements (717)
- Building & Construction (379)
- Carpentry (20)
- Do-It-Yourself (38)
- Electrical (73)
- Heating, Ventilation & Air Conditioning (69)
- Home Design & Construction (66)
- Home Repair (90)
- How to Do Everything (5)
- Masonry (26)
- Plumbing & Household Automation (23)
- Remodeling & Renovation (21)
- Interior Design (76)
- Animal Care & Pets (59)
- Humanities (7493)
- Art History (77)
- Digital Photography & Video (512)
- Adobe Photoshop (222)
- Adobe Photoshop Elements (13)
- Digital Photography (262)
- Digital Printing (7)
- Equipment (76)
- Lighting (28)
- Portraits (44)
- Video Production (10)
- Essays & Commentary (42)
- Foreign Languages (1464)
- History & Criticism (579)
- History & Philosophy (14)
- Library & Information Science (49)
- Linguistics (765)
- Literary (203)
- Literature (767)
- American Literature (75)
- Books & Reading (12)
- Creative Writing & Composition (77)
- English Literature (147)
- Literary Theory (76)
- World Literature (190)
- Museums & Collections (80)
- Performing Arts (585)
- Cinematography (32)
- Digital Music (72)
- Film & Television (207)
- Music (176)
- Theater (30)
- Reference (2302)
- Visual Arts (496)
- Design (64)
- Drawing (66)
- Painting (32)
- Photography (327)
- Law (1257)
- Administrative Law (66)
- Business Law (205)
- Construction (18)
- Contracts (19)
- Corporate Law (26)
- Franchising (53)
- Labor & Employment (23)
- Property (20)
- Constitutional Law (103)
- Human Rights (44)
- Criminal Law (184)
- Criminal Procedure (19)
- Law Enforcement (89)
- English Law (44)
- Environmental & Natural Resources Law (78)
- Family & Health Law (77)
- Intellectual Property (27)
- International Law (88)
- Law Practice & Reference (118)
- Legal History (61)
- Legal Reference (27)
- Media & the Law (17)
- One-L & Legal Profession (12)
- Perspectives on Law (276)
- Comparative (41)
- Jurisprudence (79)
- Non-US Legal Systems (123)
- Procedures & Litigation (66)
- Civil Procedure (32)
- Courts (23)
- Specialties (49)
- Air & Space (26)
- Tax Law (13)
- Literature & Fiction (1194)
- Classics (259)
- Comics & Graphic Novels (37)
- Contemporary (45)
- Drama (70)
- Fiction (364)
- Action & Adventure (48)
- Fairy Tales (60)
- Historical (111)
- War (26)
- Mystery & Thrillers (100)
- Mystery (39)
- Women Sleuths (15)
- Police Procedurals (12)
- Thrillers (57)
- Psychological Thrillers (15)
- Spy Stories & Tales of Intrigue (10)
- Suspense (36)
- Mystery (39)
- Romance (52)
- Science Fiction & Fantasy (325)
- Fantasy (73)
- Gaming (60)
- Science Fiction (181)
- Adventure (25)
- United States (24)
- Humor (24)
- World Literature (85)
- Mathematics (6880)
- Algebra & Trigonometry (868)
- Applied (207)
- Calculus (542)
- Geometry (936)
- Statistics (1410)
- Medicine & Healthcare (14470)
- Alternative Medicine (40)
- Basic Sciences (4980)
- Anatomy (643)
- Biochemistry (1939)
- Biotechnology (732)
- Embryology (21)
- Genetics (984)
- Histology (39)
- Immunology (207)
- Medical Informatics (47)
- Microbiology (804)
- Neuroanatomy (40)
- Neuroscience (422)
- Parasitology (14)
- Pathology (183)
- Pathophysiology (34)
- Physiology (304)
- Toxicology (273)
- Clinical (4072)
- Anesthesiology (74)
- Cardiology (239)
- Chemotherapy (15)
- Critical Care (76)
- Dermatology (110)
- Diagnosis (108)
- Diseases (137)
- Emergency Medicine (94)
- Endocrinology (108)
- Family & General Practice (175)
- Forensic Medicine (79)
- Gastroenterology (80)
- Geriatrics (53)
- Hematology (72)
- Infectious Diseases (165)
- Internal Medicine (1328)
- Mental Health (174)
- Nephrology (40)
- Neurology (373)
- Nutrition (186)
- Obstetrics & Gynecology (116)
- Occupational & Industrial Medicine (23)
- Oncology (303)
- Ophthalmology (73)
- Orthopedics (127)
- Otorhinolaryngology (50)
- Pain Medicine (95)
- Pediatrics (192)
- Perinatology & Neonatology (27)
- Physical Medicine & Rehabilitation (66)
- Prosthesis (123)
- Psychiatry (229)
- Pulmonary & Thoracic Medicine (75)
- Radiology & Nuclear Medicine (219)
- Diagnostic Imaging (142)
- Ultrasonography (37)
- Reproductive Medicine & Technology (20)
- Rheumatology (39)
- Sports Medicine (100)
- Surgery (980)
- Colon & Rectal (21)
- General (788)
- Neurosurgery (61)
- Oral & Maxillofacial (21)
- Plastic & Cosmetic (48)
- Thoracic (28)
- Urology (118)
- Vascular (29)
- Dentistry (192)
- Oral Surgery (38)
- Preventive (42)
- Education & Training (129)
- General medicine (880)
- Health Professions & Services (462)
- Audiology & Speech Pathology (44)
- Chiropractic (16)
- Emergency Medical Services (48)
- Medical Assistants (55)
- Medical Technology (89)
- Occupational Therapy (36)
- Optometry (18)
- Physical Therapy (87)
- Radiologic & Ultrasound Technology (73)
- Hospice Care (18)
- Laboratory Medicine (123)
- Medicine Economics & Administration (398)
- Health Care Delivery (130)
- Health Policy (50)
- Health Risk Assessment (20)
- Hospital Administration & Care (86)
- Medical History & Records (25)
- Practice Management & Reimbursement (19)
- Public Health (127)
- Nursing (404)
- Administration & Management (26)
- Clinical (128)
- Assessment & Diagnosis (26)
- Critical & Intensive Care (42)
- Medical & Surgical (50)
- Psychiatric (20)
- Fundamentals & Skills (41)
- Home & Community Health (19)
- Issues, Trends & Roles (17)
- Pharmacology (109)
- Psychiatry & Mental Health (40)
- Research & Theory (14)
- Reviews & Study Guides (18)
- Test Preparation & Review (18)
- Pharmacology (3356)
- Chemistry (2963)
- Drug Delivery Systems (20)
- Molecular (8)
- Neuropsychopharmacology (12)
- Pharmacy (479)
- Product Development (40)
- Reference (145)
- Atlases (92)
- Dictionaries & Terminology (23)
- Drug Guides (17)
- Instruments & Supplies (13)
- Research (937)
- Biostatistics (238)
- Epidemiology (90)
- Special Topics (1548)
- History (1534)
- Test Preparation (298)
- Veterinary Medicine (103)
- Equine Medicine (18)
- Food Animals (13)
- Small Animal Medicine (38)
- Nature & Ecology (1897)
- Animal Rights (30)
- Conservation (171)
- Endangered Species (27)
- Environmentalism (53)
- Ecosystems (21)
- Environment (1249)
- Environmental Studies (829)
- Recycling (55)
- Weather (453)
- Field Guides & Rocks and Minerals (32)
- Hiking & Camping (41)
- Lakes & Ponds (54)
- Natural History (16)
- Natural Resources (143)
- Fisheries & Aquaculture (72)
- Forests & Forestry (50)
- Oceans & Seas (78)
- Marine Life (42)
- Rocks & Minerals (24)
- Survival Skills (20)
- Water Supply & Land Use (53)
- Nonfiction (5699)
- Automotive (71)
- Foreign Language Nonfiction (53)
- Transportation (98)
- Aviation (54)
- Commercial (39)
- Piloting & Flight Instruction (24)
- Railroads (17)
- Ships (27)
- Aviation (54)
- True Accounts (117)
- Espionage (31)
- Murder & Mayhem (17)
- True Crime (75)
- Philosophy (1150)
- Aesthetics (38)
- Epistemology (117)
- Ethics (280)
- History & Surveys (402)
- Logic (139)
- Metaphysics (105)
- Physics (8572)
- Acoustics & Sound (254)
- Chaos Theory (109)
- Chemical Physics (110)
- Dynamics (1043)
- Fluid Dynamics (546)
- Thermodynamics (566)
- Electromagnetism (506)
- Electricity (220)
- Magnetism (218)
- Entropy (54)
- Gravity (200)
- Mathematical Physics (2062)
- Mechanics (1518)
- Nanostructures (232)
- Nuclear Physics (978)
- Atomic & Nuclear Physics (489)
- Particle Physics (515)
- Optics (613)
- Quantum Theory (1149)
- Relativity (264)
- Solid-State Physics (878)
- Condensed Matter (813)
- System Theory (236)
- Time (32)
- Waves & Wave Mechanics (439)
- Political Science (1632)
- Government (501)
- Civics (36)
- Congresses, Senates, & Legislative Bodies (21)
- Constitutions (25)
- Democracy (147)
- Federal Government (48)
- Public Affairs & Administration (93)
- State & Local Government (36)
- International Relations (323)
- Political History (249)
- Political Ideologies (153)
- Political Parties (82)
- Blue Politics (32)
- Purple Politics (24)
- Red Politics (26)
- Public Affairs (37)
- Public Policy (573)
- Government (501)
- Psychology (1166)
- Behavioral Psychology (37)
- Clinical Psychology (130)
- Cognitive Psychology (633)
- Developmental Psychology (74)
- Neuropsychology (120)
- Psychopathology (102)
- Psychotherapy (161)
- Reference (2799)
- Almanacs & Yearbooks & Annuals (42)
- Atlases & Maps (10)
- Catalogs & Directories (33)
- Consumer Guides (23)
- Dictionaries & Thesauruses (639)
- English (103)
- Foreign Language (161)
- Science (342)
- Slang & Idioms (33)
- Synonyms & Antonyms (20)
- Education (374)
- Book Notes (16)
- College Guides (33)
- Questions & Answers (108)
- Test Guides – Careers (15)
- Test Guides – College & University (70)
- Advanced Placement (20)
- College Entrance (30)
- SAT & PSAT (21)
- Test Guides – Graduate & Professional (110)
- GMAT (15)
- GRE (10)
- Professional (74)
- TOEFL & TOEIC (19)
- Workbooks (26)
- Encyclopedias (1075)
- Antiques & Collectibles (423)
- Art (89)
- Children's (68)
- Cooking (64)
- Gardening (10)
- Medical (164)
- Mythology & Folklore (60)
- Pop Culture (12)
- Religion (138)
- Sports (172)
- Veterinary (27)
- Etiquette & Conversation (25)
- Foreign Languages (94)
- Instruction (15)
- Italian (16)
- Latin (28)
- Sign Language (36)
- Fun Facts & Curiosities & Wonders (18)
- Genealogy (21)
- Publishing & Books (52)
- Authorship (34)
- Bibliographies & Indexes (15)
- Quotations (26)
- Study Guides (534)
- Words & Language (33)
- Writing Skills (35)
- Relationships (429)
- Dysfunctional Relationships (17)
- Family & Parenting (25)
- Fertility (16)
- Interpersonal Relations (162)
- Love & Romance (73)
- Marriage (47)
- Motherhood (15)
- Special Needs & Disabilities (24)
- Weddings (17)
- Religion & Spirituality (1974)
- Christianity (757)
- Earth-Based Religions (79)
- Wicca (38)
- Witchcraft (42)
- Islam (117)
- Judaism (131)
- History of Religion (54)
- Jewish Life (16)
- Sacred Writings (36)
- Kabbalah (16)
- Theology (20)
- New Age (72)
- Divination (24)
- Mental & Spiritual Healing (22)
- New Thought (26)
- Other Eastern Religions (41)
- Other Practices (90)
- Religious Studies (590)
- Buddhism (40)
- Church & State (73)
- Comparative Religion (127)
- Controversial Knowledge (41)
- Gender & Sexuality (21)
- Religious History (103)
- Science & Religion (80)
- Science & Research (8453)
- Experiments, Instruments & Measurement (340)
- Electron Microscopes & Microscopy (52)
- Experiments & Projects (43)
- Measurement (183)
- Scientific Instruments (51)
- Telescopes (16)
- Science for Kids (68)
- Experiments, Instruments & Measurement (340)
- Social Sciences (2718)
- Anthropology (355)
- Archaeology (175)
- Communication & Journalism (115)
- Journalism (30)
- Media Studies (84)
- Crime & Criminals (445)
- Criminology (254)
- Forensic Science (228)
- Penology (53)
- Gender Studies (1218)
- Gay & Lesbian Studies (1022)
- Civil Rights (75)
- Literature & Fiction (905)
- Women's Studies (142)
- Feminist Theory (70)
- Women Writers (40)
- Gay & Lesbian Studies (1022)
- Military Sciences (89)
- Sociology (439)
- Sports (131)
- Boating (32)
- Coaching (14)
- History of Sports (22)
- Individual Sports (56)
- Mountain Climbing (15)
- Tourism & Travel (469)
- Australia & South Pacific (17)
- Caribbean (27)
- Ecotourism (26)
- Guidebook Series (202)
- Adventure Guides (19)
- Frommer's (130)
- Lonely Planet (48)
- North America (71)
- Reference & Tips (213)
- Essays & Travelogues (23)
- Food & Lodging (22)
- Guidebooks (84)
- Accounting (1094)