Ταξιθετικός Αριθμός
L - Education
665
Q - Science
507
H - Social Science
420
R - Medicine
199
S - Agriculture
158
B - Philosophy, Psychology, Religion
153
T - Technology
125
P - Language and Literature
58
G - Geography, Anthropology, Recreation
40
J - Political Science
38
K - Law
33
A - General Works
22
Z - Library Science
16
N - Fine Arts
14
D - World History
9
C - Historical Sciences
6
F - General American History
3