Classification
T - Technology
109
B - Philosophy, Psychology, Religion
19
A - General Works
18
R - Medicine
16
M - Music
12
P - Language and Literature
10
D - World History
9
C - Historical Sciences
8
H - Social Science
5
E - United States History
1
F - General American History
1
S - Agriculture
1
U - Military Science
1
Z - Library Science
1