Classification
P - Language and Literature
64,164
Q - Science
4,745
H - Social Science
1,080
R - Medicine
1,034
T - Technology
1,028
S - Agriculture
932
B - Philosophy, Psychology, Religion
711
D - World History
315
G - Geography, Anthropology, Recreation
210
J - Political Science
138
L - Education
122
N - Fine Arts
106
K - Law
88
M - Music
88
A - General Works
75
F - General American History
40
E - United States History
29
U - Military Science
24
V - Naval Science
21
C - Historical Sciences
20
Z - Library Science
14