Topogràfic
B - Filosofia, Psicologia, Religió
983
H - Social Science
280
R - Medicine
135
K - Law
69
L - Education
31
J - Political Science
12
G - Geography, Anthropology, Recreation
5
N - Fine Arts
5
C - Historical Sciences
4
P - Language and Literature
4
S - Agriculture
4
A - Treballs generalss
3
Q - Science
3
T - Technology
2
D - World History
1
E - United States History
1
U - Military Science
1