Topogràfic
K - Law
983
P - Language and Literature
625
H - Social Science
624
L - Education
619
J - Political Science
567
Q - Science
332
F - General American History
311
R - Medicine
273
G - Geography, Anthropology, Recreation
219
B - Filosofia, Psicologia, Religió
159
S - Agriculture
150
T - Technology
110
C - Historical Sciences
42
D - World History
35
Z - Library Science
16
N - Fine Arts
13
A - Treballs generalss
1
U - Military Science
1