Classification
P - Language and Literature
48
T - Technology
37
Q - Science
22
R - Medicine
18
B - Philosophy, Psychology, Religion
16
D - World History
14
E - United States History
10
S - Agriculture
9
A - General Works
7
M - Music
7
H - Social Science
6
C - Historical Sciences
4
F - General American History
2
G - Geography, Anthropology, Recreation
2
N - Fine Arts
1