Library of Congress Classification

 

http://www.loc.gov/catdir/cpso/lcco/lcco.html

A GENERAL WORKS
  AE Encyclopedias
  AY Almanacs

B PHILOSOPHY
  BF Psychology
  BL-BX Religion

C HISTORY
  CB History of Civilization
  CC Archaeology
  CT General Biography

D HISTORY

E U.S. HISTORY
  E186 Colonial History
  E456 Civil War
  E740 Twentieth Century

F HISTORY OF THE AMERICAS
  F1 State Histories
  F381 Texas
  F1001 Canada

G GEOGRAPHY
  GN Anthropology. Ethnology
  GR-GT Folklore. Manner. Customs

H SOCIAL SCIENCES
  HA Statistics
  HB-HD
  HF Business
  HM Sociology
  HQ The Family. Marriage. Women

J POLITICAL SCIENCE
  JK U.S.
  JS Local Government
  JX International Relations

K LAW
 KF U.S. Law

L EDUCATION

M MUSIC

N FINE ARTS
  NA-NB Architecture. Sculpture
  NC-NE Drawing, Painting, Prints

P LANGUAGE AND LITERATURE
  PA Classical Language, Literature
  PC2001 French Language
  PC4001 Spanish Language
  PE English Language
  PE1128 English as a Second Language
  PF German Language
  PN Poetry. Theater. Speech. Journalism
  PQ1 French Literature
  PQ6001 Spanish Literature
  PR British Literature
  PS American Literature
  PT German Literature

Q SCIENCE
  QA Mathematics
  QA76 Computer Science
  QB Astronomy
  QC Physics
  QH Natural History

R MEDICINE

S AGRICULTURE

T TECHNOLOGY
  TJ Mechanical Engineering
  TK Electrical Engineering. Electronics
  TR Photography

U-V MILITARY SCIENCE AND NAVAL

Z BIBLIOGRAPHY, PUBLISHING, LIBRARY SCIENCE