Topogràfic
F - General American History
26
H - Social Science
13
K - Law
12
J - Political Science
10
L - Education
8
P - Language and Literature
7
D - World History
6
G - Geography, Anthropology, Recreation
4
B - Filosofia, Psicologia, Religió
3
N - Fine Arts
2
Z - Library Science
2
A - Treballs generalss
1
Q - Science
1