Classification
Q - Science
79
P - Language and Literature
73
R - Medicine
36
S - Agriculture
21
C - Historical Sciences
18
A - General Works
15
B - Philosophy, Psychology, Religion
10
F - General American History
8
H - Social Science
7
T - Technology
4
E - United States History
3
D - World History
2
M - Music
2
Z - Library Science
2
G - Geography, Anthropology, Recreation
1