Topogràfic
P - Language and Literature
125
Q - Science
32
L - Education
22
G - Geography, Anthropology, Recreation
13
R - Medicine
10
H - Social Science
9
K - Law
7
T - Technology
6
N - Fine Arts
4
B - Filosofia, Psicologia, Religió
2
J - Political Science
2
C - Historical Sciences
1
D - World History
1
F - General American History
1
S - Agriculture
1
U - Military Science
1
Z - Library Science
1