Classification
R - Medicine
934
P - Language and Literature
775
C - Historical Sciences
516
S - Agriculture
292
B - Philosophy, Psychology, Religion
228
A - General Works
201
Q - Science
78
D - World History
55
M - Music
27
F - General American History
23
E - United States History
8
H - Social Science
5
T - Technology
3
G - Geography, Anthropology, Recreation
2
L - Education
2
K - Law
1