Topogràfic
P - Language and Literature
458
B - Filosofia, Psicologia, Religió
252
H - Social Science
116
D - World History
110
J - Political Science
68
K - Law
55
F - General American History
54
N - Fine Arts
27
Q - Science
27
G - Geography, Anthropology, Recreation
19
L - Education
15
R - Medicine
10
C - Historical Sciences
9
M - Music
7
T - Technology
7
Z - Library Science
4
A - Treballs generalss
3
E - United States History
3
U - Military Science
3