Topogràfic
D - World History
406
F - General American History
223
P - Language and Literature
173
H - Social Science
88
K - Law
54
J - Political Science
40
E - United States History
25
U - Military Science
25
B - Filosofia, Psicologia, Religió
16
N - Fine Arts
11
C - Historical Sciences
5
L - Education
4
G - Geography, Anthropology, Recreation
3
M - Music
3
R - Medicine
3
V - Naval Science
3
Z - Library Science
3
Q - Science
2
T - Technology
2
A - Treballs generalss
1