Ταξιθετικός Αριθμός
L - Education
6.914
G - Geography, Anthropology, Recreation
491
H - Social Science
336
Q - Science
156
R - Medicine
149
B - Philosophy, Psychology, Religion
146
P - Language and Literature
109
T - Technology
104
K - Law
74
D - World History
68
A - General Works
60
Z - Library Science
53
N - Fine Arts
28
J - Political Science
24
F - General American History
18
M - Music
17
S - Agriculture
10
C - Historical Sciences
8
U - Military Science
1