Classification
P - Language and Literature
714,204
Q - Science
15,200
H - Social Science
10,094
B - Philosophy, Psychology, Religion
6,796
K - Law
5,724
D - World History
4,492
R - Medicine
3,417
A - General Works
2,734
T - Technology
2,609
S - Agriculture
2,307
J - Political Science
2,006
N - Fine Arts
1,690
G - Geography, Anthropology, Recreation
1,235
L - Education
1,177
M - Music
1,093
Z - Library Science
271
F - General American History
222
U - Military Science
188
C - Historical Sciences
184
E - United States History
129
V - Naval Science
68