Topogràfic
Z - Library Science
22
P - Language and Literature
16
F - General American History
9
H - Social Science
7
M - Music
3
B - Filosofia, Psicologia, Religió
2
D - World History
2
L - Education
2
Q - Science
2
S - Agriculture
2
G - Geography, Anthropology, Recreation
1
K - Law
1
R - Medicine
1
U - Military Science
1