Classification
P - Language and Literature
16,786
Q - Science
1,988
H - Social Science
1,437
R - Medicine
1,080
B - Philosophy, Psychology, Religion
1,002
D - World History
699
A - General Works
373
L - Education
280
F - General American History
275
T - Technology
273
G - Geography, Anthropology, Recreation
242
J - Political Science
171
K - Law
153
N - Fine Arts
130
S - Agriculture
114
M - Music
94
C - Historical Sciences
69
E - United States History
47
Z - Library Science
41
U - Military Science
29
V - Naval Science
10