Topogràfic
P - Language and Literature
115
D - World History
106
H - Social Science
72
K - Law
48
B - Filosofia, Psicologia, Religió
33
J - Political Science
29
N - Fine Arts
10
T - Technology
7
G - Geography, Anthropology, Recreation
6
L - Education
6
F - General American History
5
M - Music
4
A - Treballs generalss
3
C - Historical Sciences
3
R - Medicine
3
S - Agriculture
2
Z - Library Science
2