Topogràfic
Q - Science
51
T - Technology
28
P - Language and Literature
18
H - Social Science
16
D - World History
11
R - Medicine
10
G - Geography, Anthropology, Recreation
6
B - Filosofia, Psicologia, Religió
4
A - Treballs generalss
2
N - Fine Arts
2
S - Agriculture
2
C - Historical Sciences
1
K - Law
1
L - Education
1
M - Music
1
U - Military Science
1
Z - Library Science
1