Topogràfic
J - Political Science
626
H - Social Science
163
K - Law
56
L - Education
24
F - General American History
22
B - Filosofia, Psicologia, Religió
13
G - Geography, Anthropology, Recreation
7
P - Language and Literature
7
C - Historical Sciences
6
D - World History
6
T - Technology
6
S - Agriculture
5
Z - Library Science
4
A - Treballs generalss
3
E - United States History
3
Q - Science
2
R - Medicine
2
V - Naval Science
1