Classification
Q - Science
1,736
R - Medicine
728
D - World History
642
P - Language and Literature
414
B - Philosophy, Psychology, Religion
347
E - United States History
146
T - Technology
132
C - Historical Sciences
118
A - General Works
89
F - General American History
71
M - Music
68
G - Geography, Anthropology, Recreation
55
H - Social Science
30
Z - Library Science
24
S - Agriculture
12