Topogràfic
H - Social Science
198
J - Political Science
18
B - Filosofia, Psicologia, Religió
11
G - Geography, Anthropology, Recreation
8
K - Law
6
C - Historical Sciences
5
P - Language and Literature
5
Z - Library Science
5
S - Agriculture
4
L - Education
3
R - Medicine
3
T - Technology
3
M - Music
1
U - Military Science
1