Topogràfic
P - Language and Literature
545
Q - Science
305
L - Education
291
G - Geography, Anthropology, Recreation
108
H - Social Science
107
N - Fine Arts
105
B - Filosofia, Psicologia, Religió
95
R - Medicine
83
K - Law
54
T - Technology
50
J - Political Science
47
D - World History
28
F - General American History
7
C - Historical Sciences
5
Z - Library Science
5
M - Music
2
S - Agriculture
2
U - Military Science
2
A - Treballs generalss
1
E - United States History
1