CLASSIFICATION
L - Education
36,954
T - Technology
4,253
E - United States History
228
H - Social Science
210
M - Music
143
S - Agriculture
118
C - Historical Sciences
46
U - Military Science
44
G - Geography, Anthropology, Recreation
34
D - World History
28
Q - Science
24
B - Philosophy, Psychology, Religion
23
J - Political Science
21
R - Medicine
19
P - Language and Literature
16
V - Naval Science
15
K - Law
14
N - Fine Arts
10
Z - Library Science
6
A - General Works
3
F - General American History
3