Classification
Q - Science
1,269
R - Medicine
728
D - World History
642
P - Language and Literature
413
B - Philosophy, Psychology, Religion
346
E - United States History
145
C - Historical Sciences
117
T - Technology
105
A - General Works
82
F - General American History
68
M - Music
65
G - Geography, Anthropology, Recreation
40
H - Social Science
27
Z - Library Science
16
S - Agriculture
10