Classification
P - Language and Literature
715,287
Q - Science
15,367
H - Social Science
11,187
B - Philosophy, Psychology, Religion
7,572
K - Law
6,088
M - Music
5,940
D - World History
5,204
R - Medicine
3,493
A - General Works
2,774
T - Technology
2,666
S - Agriculture
2,339
J - Political Science
2,100
N - Fine Arts
1,804
F - General American History
1,651
L - Education
1,383
G - Geography, Anthropology, Recreation
1,290
E - United States History
615
C - Historical Sciences
547
Z - Library Science
290
U - Military Science
198
V - Naval Science
68