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- A - General Reference Works and Journals (18,386)
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- AG - General Reference Works and Journals - Dictionaries and Reference (596)
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- B - Philosophy. Psychology. Religion - Philosophy in General (33,752)
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- M - Music - In General (44,772)
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- N - Fine Arts - Visual Arts (36,657)
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- P - Language and Literature - Philology, Linguistics (14,882)
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- PZ - Language and Literature - Fiction (15,497)
- Q - Science - General (10,062)
- QA - Science - Mathematics (41,811)
- QB - Science - Astronomy (8,176)
- QC - Science - Physics (19,561)
- QD - Science - Chemistry (9,109)
- QE - Science - Geology (6,897)
- QH - Science - Natural History and Biology (13,887)
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- QL - Science - Zoology (9,407)
- QM - Science - Human Anatomy (1,396)
- QP - Science - Physiology (8,195)
- QR - Science - Microbiology (2,063)
- R - Medicine - General (7,533)
- RA - Medicine - Public Medicine (7,907)
- RB - Medicine - Pathology (1,285)
- RC - Medicine - Internal Medicine (21,166)
- RD - Medicine - Surgery (4,829)
- RE - Medicine - Ophthalmology (1,020)
- RF - Medicine - Otorhinolarynhology (810)
- RG - Medicine - Gynecology and Obstetrics (2,563)
- RJ - Medicine - Pediatrics (4,900)
- RK - Medicine - Dentistry (252)
- RL - Medicine - Dermatology (618)
- RM - Medicine - Therapeutics and Pharmacology (2,625)
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- RX - Medicine - Homeopathy (97)
- RZ - Medicine - Other Systems of Medicine (138)
- S - Agriculture - General (9,250)
- SB - Agriculture - Plant Culture (7,573)
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- T - Technology - General (6,919)
- TA - Technology - General and Civil Engineering (11,429)
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- TL - Technology - Motor Vehicles, Aeronautics and Astronautics (5,647)
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- TX - Technology - Home Economics (3,806)
- U - Military Science - General (5,130)
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- W - Health Sciences (401)
- Z - Bibliography. Library Science. Information Resources - General (54,170)
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