Classification
Q - Science
148
P - Language and Literature
133
R - Medicine
66
C - Historical Sciences
36
B - Philosophy, Psychology, Religion
32
M - Music
30
G - Geography, Anthropology, Recreation
26
S - Agriculture
22
D - World History
15
F - General American History
11
E - United States History
9
A - General Works
8
N - Fine Arts
4
H - Social Science
2
T - Technology
2