Ταξιθετικός Αριθμός
L - Education
1.351
H - Social Science
72
R - Medicine
57
P - Language and Literature
28
G - Geography, Anthropology, Recreation
26
B - Philosophy, Psychology, Religion
22
Q - Science
20
T - Technology
13
K - Law
10
N - Fine Arts
8
Z - Library Science
8
C - Historical Sciences
7
S - Agriculture
6
A - General Works
5
E - United States History
5
M - Music
3
D - World History
1