Topogràfic
F - General American History
287
J - Political Science
258
H - Social Science
103
D - World History
94
K - Law
24
P - Language and Literature
10
E - United States History
9
B - Filosofia, Psicologia, Religió
8
L - Education
3
S - Agriculture
2
T - Technology
2
G - Geography, Anthropology, Recreation
1
Q - Science
1