Classification
P - Language and Literature
744,406
Q - Science
15,722
H - Social Science
10,551
B - Philosophy, Psychology, Religion
7,119
K - Law
5,830
D - World History
4,709
R - Medicine
3,569
A - General Works
2,811
T - Technology
2,746
S - Agriculture
2,400
J - Political Science
2,088
N - Fine Arts
1,775
G - Geography, Anthropology, Recreation
1,305
L - Education
1,223
M - Music
1,124
Z - Library Science
289
F - General American History
233
U - Military Science
200
C - Historical Sciences
193
E - United States History
134
V - Naval Science
71