Classification
T - Technology
66
H - Social Science
59
R - Medicine
54
Q - Science
51
S - Agriculture
51
B - Philosophy, Psychology, Religion
16
M - Music
13
P - Language and Literature
13
D - World History
9
N - Fine Arts
9
Z - Library Science
9
G - Geography, Anthropology, Recreation
8
K - Law
7
E - United States History
5
L - Education
5
C - Historical Sciences
4
J - Political Science
4
A - General Works
3
F - General American History
2
U - Military Science
1