Classification
R - Medicine
142
T - Technology
45
B - Philosophy, Psychology, Religion
42
E - United States History
25
Q - Science
23
D - World History
21
C - Historical Sciences
11
P - Language and Literature
6
A - General Works
5
H - Social Science
3
M - Music
2
S - Agriculture
2
F - General American History
1
G - Geography, Anthropology, Recreation
1