Ταξιθετικός Αριθμός
L - Education
612
Q - Science
54
P - Language and Literature
42
G - Geography, Anthropology, Recreation
36
H - Social Science
22
M - Music
11
R - Medicine
10
B - Philosophy, Psychology, Religion
8
K - Law
6
N - Fine Arts
5
T - Technology
4
D - World History
3
F - General American History
3
J - Political Science
3
A - General Works
1
Z - Library Science
1