Classification
R - Medicine
199
T - Technology
111
B - Philosophy, Psychology, Religion
73
D - World History
55
H - Social Science
37
E - United States History
30
Q - Science
24
M - Music
20
P - Language and Literature
20
C - Historical Sciences
11
A - General Works
6
K - Law
3
S - Agriculture
3
F - General American History
2
G - Geography, Anthropology, Recreation
1