Classification
P - Language and Literature
16,788
Q - Science
1,988
H - Social Science
1,437
R - Medicine
1,081
B - Philosophy, Psychology, Religion
1,001
D - World History
697
A - General Works
373
L - Education
280
F - General American History
275
T - Technology
273
G - Geography, Anthropology, Recreation
241
J - Political Science
170
K - Law
153
N - Fine Arts
129
S - Agriculture
114
M - Music
94
C - Historical Sciences
68
E - United States History
47
Z - Library Science
41
U - Military Science
29
V - Naval Science
10