Classification
P - Language and Literature
36,606
H - Social Science
205
S - Agriculture
176
Q - Science
168
B - Philosophy, Psychology, Religion
150
N - Fine Arts
98
D - World History
80
R - Medicine
75
K - Law
56
M - Music
38
L - Education
20
T - Technology
17
J - Political Science
16
G - Geography, Anthropology, Recreation
15
Z - Library Science
7
A - General Works
5
U - Military Science
5
E - United States History
4
C - Historical Sciences
3