Classification
P - Language and Literature
744,518
Q - Science
15,734
H - Social Science
10,551
B - Philosophy, Psychology, Religion
7,120
K - Law
5,830
D - World History
4,709
R - Medicine
3,570
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
1,310
L - Education
1,224
M - Music
1,124
Z - Library Science
290
F - General American History
233
U - Military Science
200
C - Historical Sciences
193
E - United States History
134
V - Naval Science
71