Library of Congress catalogue scheme

A -- GENERAL WORKS

B -- PHILOSOPHY. PSYCHOLOGY. RELIGION

C -- AUXILIARY SCIENCES OF HISTORY

D -- HISTORY: GENERAL AND OLD WORLD

E -- HISTORY: AMERICA

F -- HISTORY: AMERICA

G -- GEOGRAPHY. ANTHROPOLOGY. RECREATION

H -- SOCIAL SCIENCES

J -- POLITICAL SCIENCE

K -- LAW

L -- EDUCATION

M -- MUSIC AND BOOKS ON MUSIC

N -- FINE ARTS

P -- LANGUAGE AND LITERATURE

Q -- SCIENCE

R -- MEDICINE

S -- AGRICULTURE

T -- TECHNOLOGY

U -- MILITARY SCIENCE

V -- NAVAL SCIENCE

Z -- LIBRARY SCIENCE