Classification
T - Technology
51
M - Music
44
H - Social Science
43
R - Medicine
26
S - Agriculture
22
B - Philosophy, Psychology, Religion
18
P - Language and Literature
10
D - World History
9
A - General Works
8
C - Historical Sciences
8
G - Geography, Anthropology, Recreation
7
E - United States History
3
Q - Science
2
Z - Library Science
2
F - General American History
1
J - Political Science
1