Topogràfic
P - Language and Literature
89
H - Social Science
47
J - Political Science
24
B - Filosofia, Psicologia, Religió
20
D - World History
20
K - Law
19
F - General American History
17
L - Education
14
G - Geography, Anthropology, Recreation
11
N - Fine Arts
9
Q - Science
6
C - Historical Sciences
4
R - Medicine
3
T - Technology
3
A - Treballs generalss
1
E - United States History
1
S - Agriculture
1
Z - Library Science
1