Classification
P - Language and Literature
12,832
Q - Science
120
B - Philosophy, Psychology, Religion
91
H - Social Science
43
D - World History
41
J - Political Science
33
K - Law
33
N - Fine Arts
22
R - Medicine
17
A - General Works
10
L - Education
9
G - Geography, Anthropology, Recreation
8
T - Technology
7
M - Music
5
S - Agriculture
5
U - Military Science
2
C - Historical Sciences
1
E - United States History
1