Library of Congress Classification

A General Works
AE  Encyclopedias
AG  Dictionaries
B     Philosophy/Psychology/Religion
B  Philosophy
BF  Psychology
BJ  Ethics
BM  Judaism
BR  Christianity
BS  The Bible
BX  Christian denominations
C     History
CB  History of civilization
CT  Biography
D     History (except American)
DA  Great Britain
DC  France
DD  Germany
DK  Russia
DS  Asia
DT  Africa
E     History - American
F      History: United States (local)
Americas except U.S.
G     Geography/Anthropology
GB-GC  Geography & oceans
GN  Anthropology
GV  Recreation & sports
H     Social Sciences
HA  Statistics
HB  Economics
HD  Management, human relations
HM  Sociology
HQ  Family, marriage, women
HV  Social service
J     Political Science
JC  Political theory, politics
JK  United States
K    Law
L    Education
LA  History of education
LB  Theory & practice
LC  Special aspects of education
M     Music
ML  Literature of music
MT  Music instruction
N     Fine Art
NA  Architecture
NB  Sculpture
NC  Drawing
ND  Painting
P      Languages & Literature
PA  Classical language & literature
PC  Romance languages
PE  English language
PN  Literature history/collections/drama
PR   English literature
PS  American literature
PT  German literature
Q      Science
QA  Mathematics/computers
QC  Physics
QD  Chemistry
QH  Biology
QK  Botany
QM  Human anatomy
QP  Physiology
QR  Microbiology
R       Medicine
RA  Public aspects of medicine
RT  Nursing
S     Agriculture
T     Technology
TR  Photography
U     Military history
V     Naval science
Z     Bibliography & Library Science