Topogràfic
K - Law
1,651
H - Social Science
1,198
D - World History
866
P - Language and Literature
433
L - Education
379
J - Political Science
307
B - Filosofia, Psicologia, Religió
250
N - Fine Arts
225
G - Geography, Anthropology, Recreation
206
Q - Science
199
T - Technology
192
R - Medicine
148
C - Historical Sciences
93
M - Music
54
F - General American History
49
Z - Library Science
48
S - Agriculture
35
U - Military Science
31
E - United States History
11
A - Treballs generalss
9
V - Naval Science
8