Classification
H - Social Science
90
R - Medicine
34
P - Language and Literature
23
B - Philosophy, Psychology, Religion
16
F - General American History
15
D - World History
14
A - General Works
10
M - Music
9
C - Historical Sciences
7
T - Technology
6
E - United States History
2
G - Geography, Anthropology, Recreation
1
Q - Science
1
S - Agriculture
1