Ταξιθετικός Αριθμός
T - Technology
287
Q - Science
277
P - Language and Literature
169
H - Social Science
73
R - Medicine
32
B - Philosophy, Psychology, Religion
20
L - Education
14
S - Agriculture
11
G - Geography, Anthropology, Recreation
8
N - Fine Arts
7
K - Law
5
F - General American History
4
M - Music
4
J - Political Science
3
C - Historical Sciences
2
Z - Library Science
2
A - General Works
1
D - World History
1
E - United States History
1