Classification
P - Language and Literature
7,116
H - Social Science
334
K - Law
208
Q - Science
127
B - Philosophy, Psychology, Religion
97
D - World History
92
J - Political Science
43
N - Fine Arts
30
S - Agriculture
30
R - Medicine
21
G - Geography, Anthropology, Recreation
18
M - Music
18
T - Technology
17
L - Education
13
Z - Library Science
5
C - Historical Sciences
2
F - General American History
2
U - Military Science
2
A - General Works
1
E - United States History
1