Classification
Q - Science
2,375
R - Medicine
1,614
P - Language and Literature
1,146
D - World History
1,066
B - Philosophy, Psychology, Religion
636
C - Historical Sciences
283
T - Technology
268
E - United States History
237
M - Music
217
A - General Works
151
F - General American History
137
G - Geography, Anthropology, Recreation
113
H - Social Science
49
S - Agriculture
29
Z - Library Science
27
N - Fine Arts
2
K - Law
1