Classification
P - Language and Literature
2,332
M - Music
477
F - General American History
115
T - Technology
114
B - Philosophy, Psychology, Religion
113
R - Medicine
89
L - Education
53
A - General Works
51
D - World History
26
C - Historical Sciences
13
S - Agriculture
8
Z - Library Science
4
G - Geography, Anthropology, Recreation
2
H - Social Science
2
E - United States History
1