Classification
P - Language and Literature
5,047
D - World History
228
M - Music
213
B - Philosophy, Psychology, Religion
148
C - Historical Sciences
124
H - Social Science
112
Q - Science
96
A - General Works
94
E - United States History
71
T - Technology
64
F - General American History
61
Z - Library Science
54
J - Political Science
44
K - Law
38
R - Medicine
20
N - Fine Arts
18
L - Education
16
S - Agriculture
12
U - Military Science
11
G - Geography, Anthropology, Recreation
8