Classification
P - Language and Literature
12,801
Q - Science
118
B - Philosophy, Psychology, Religion
92
H - Social Science
43
D - World History
42
J - Political Science
33
K - Law
33
N - Fine Arts
24
R - Medicine
17
A - General Works
10
L - Education
9
G - Geography, Anthropology, Recreation
8
T - Technology
7
M - Music
6
S - Agriculture
5
C - Historical Sciences
2
U - Military Science
2
E - United States History
1