Classification
H - Social Science
67
T - Technology
39
B - Philosophy, Psychology, Religion
11
P - Language and Literature
9
R - Medicine
9
A - General Works
7
D - World History
5
M - Music
5
C - Historical Sciences
4
S - Agriculture
4
Q - Science
3
N - Fine Arts
2
E - United States History
1
F - General American History
1
K - Law
1