Ταξιθετικός Αριθμός
Q - Science
451
R - Medicine
303
T - Technology
185
H - Social Science
142
P - Language and Literature
131
L - Education
109
B - Philosophy, Psychology, Religion
80
G - Geography, Anthropology, Recreation
66
S - Agriculture
54
N - Fine Arts
37
Z - Library Science
24
J - Political Science
20
K - Law
20
D - World History
19
M - Music
13
F - General American History
6
C - Historical Sciences
3
A - General Works
1
U - Military Science
1