Topogràfic
K - Law
137
Q - Science
111
R - Medicine
109
H - Social Science
95
T - Technology
80
P - Language and Literature
79
D - World History
49
F - General American History
37
B - Filosofia, Psicologia, Religió
36
J - Political Science
35
Z - Library Science
33
G - Geography, Anthropology, Recreation
30
A - Treballs generalss
27
L - Education
27
S - Agriculture
26
N - Fine Arts
16
C - Historical Sciences
9
E - United States History
9
M - Music
4
U - Military Science
2