A | General Works
B-BJ | Philosophy, Psychology
BL-BM-BP-BQ | Religion
BR-BX | Christianity, Bible
C | Auxiliary Science of History
CB | History of Civilization
CC | Archaeology
CT | Biography
D-DR | History (General, Europe)
DS-DX | History (Asia, Africa, Australia, New zealand, etc.)
E-F | History (America)
G | Geography, Maps, Anthropology Recreation
H | Social Science
HA | Statistics
HB-HE | Economics
HF | Commerce
HG-HJ | Finance
HM-HX | Sociology
J | Political Science
K | Law
L | Education
M | Music
N | Fine Arts
P | Language and Literature Tables
PA | GreekLanguage
PC | French Language
PE | English Language
PF | German Language
PG | Russian Language and Literature
PL | Languages of Eastern (Asia, Africa, Oceania)
PL 101 – 271 | Turkish Language and Literature
PQ | Franch Literature
PR | English Literature
PS | American Literature
PT | German Literature
Q | Science
QA | Mathematics, Compuetr Science
QB | Astronomy
QC | Physics
QD | Chemistry
QE | Geology
QH | Biology
QK | Botany
QL | Zoology
QM | Human Anatomy
QP | Biochemistry
QR | Microbiology
QT | Physiology
QU | Biochemistry, Nutrition
QV | Pharmacology
QW | Microbiology and Immunology
QZ | Pathology
S | Agriculture
SB |Plant culture
SD |Forestry
SF | Animal Culture
T | Technology and Engineering
TA | Civil Engineering
TC | Hydraulic Engineering
TD | Environmental Technology
TE | Highway Engineering
TF | Railroad Engineering
TG | Bridge Engineering
TH | Building, :Construction
TJ | Mechanical Engineering
TK | Electrical Engineering
TL | Motor Vehicles
TN | Mining Engineering
TP | Chemical Technology
TR | Photography
TS | Manufactures
TT | Handicrafts
TX | Home Economics
U | Military Science
V | Naval Science
W | Medicine (National Library of Medicine)
WA | Public Health
WB | Practice of Medicine
WC | Communicable Disease
WD | Nutrition Disorders
WE | Muscualoskeletal System
WF | Respiratory System
WG | Cardiovascular System
WH | Hemic and Lymphatic Systems
WI | Digestive System
WJ | Urogenital System
WK | Endocrine System
WL | Nervous System
WM | Psychiatry
WN | Radiology
WO | Surgery
WP | Gynecology
WQ | Obstetrics
WR | Dermatology
WS | Pediatrics
WT | Geriatrics
WU | Dentistry
WV | Otorhinolaryngology
WW | Opthalmology
WX | Hospitals
WY | Nursing
WZ | History of Medicine
Z | Bibliography and Library Science