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Astronomy
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Biography & Autobiography
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Computers
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Crime, Thrillers & Mystery
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Education Studies & Teaching
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Engineering
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Fiction
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- War & Military Fiction (9709)
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History
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Housekeeping & Leisure
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- Games: Board Games (2255)
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- Glass & Metal Work (278)
- Handicraft (10469)
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- Interior Design & Decoration (10283)
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Jurisprudence & Law
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Languages
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- Grammar, dictionaries & phrasebooks (17265)
- Hindi Language Reference (67)
- Indic Languages Reference (184)
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- Japanese Language Reference (2929)
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- Latin Language Reference (1127)
- Polyglot Dictionaries (133)
- Portuguese Language Reference (321)
- Rhetoric (820)
- Romance Languages Reference (153)
- Russian Language Reference (5944)
- Slavic Languages Reference (500)
- Spanish Language Reference (1382)
- Traditional Chinese Language Ref. (122)
- Turkish Language Reference (144)
Mathematics
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- Computational Mathematics (3434)
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- Differential Equations (3402)
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- Fuzzy Logic and Applications (272)
- Game Theory (589)
- Geometry and Topology (9529)
- Graph Theory (1041)
- Lectures (448)
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- Mathematical Foundations (1814)
- Mathematical Physics (2559)
- Mathematical Statistics (4310)
- Mathematical Theory (1362)
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- The complex variable (1105)
- Wavelets and signal processing (1179)
Medicine
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- Dentistry, Orthodontics (2132)
- Dermatology (779)
- Diabetes (472)
- Diseases (1520)
- Endocrinology (702)
- ENT (283)
- Epidemiology (735)
- Feng Shui (305)
- Health-Related Professions (1510)
- Histology (531)
- Homeopathy (814)
- Immunology (1630)
- Infectious diseases (1361)
- Internal Medicine (2249)
- Medicine & Nursing Reference (1186)
- Medicine & Nursing Test Prep (427)
- Molecular Medicine (422)
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- Neurology (2433)
- Neuroscience (1943)
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- Surgery, Orthopedics (3341)
- Therapy, Psychotherapy (2257)
- Trial (482)
- Veterinary Medicine (1956)
- Yoga, Ayurveda (2265)
Nature, Animals & Pets
- Animal Care & Pets (2740)
- Animals (1159)
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- Natural Disasters (133)
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- Nature - Other (722)
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- Pet Reptiles & Amphibians (28)
- Pets - General & Miscellaneous (62)
- Plants & Fungi (695)
- Stargazing - Amateur's Manuals (12)
- Weather (70)
Physics
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- Atomic & Molecular (346)
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- Electrodynamics (1007)
- General Courses (3524)
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- Physics of the Atmosphere (193)
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Poetry
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Religion & Spirituality
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- Taoism & Confucianism (1068)
- Theosophy & New Age (6223)
Romance
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- Dark Romance (12934)
- Erotic Romance (10890)
- Fantasy (26900)
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- Other Romance Categories (41160)
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Self-Help, Relationships & Lifestyle
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Society, Politics & Philosophy
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Sports, Hobbies & Games
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- Martial Arts (5251)
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- Olympics & Olympic Sports (218)
- Other Sports (1992)
- Outdoor & Adventure Sports (818)
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- Training & Coaching (1364)
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Technique
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- Electronics (10523)
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- Electronics: Hardware (1114)
- Electronics: Home Electronics (610)
- Electronics: Microprocessor Technology (1206)
- Electronics: Radio (4672)
- Electronics: Robotics (586)
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- Electronics: TV. Video (183)
- Electronics: VLSI (212)
- Energy (12346)
- Energy: Renewable Energy (884)
- Experiments, Instruments & Measurements (4495)
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Travel
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