Ταξιθετικός Αριθμός
P - Language and Literature
23
H - Social Science
16
D - World History
8
S - Agriculture
6
A - General Works
5
Q - Science
5
T - Technology
5
G - Geography, Anthropology, Recreation
4
L - Education
4
B - Philosophy, Psychology, Religion
3
K - Law
3
M - Music
2
C - Historical Sciences
1
F - General American History
1
J - Political Science
1
N - Fine Arts
1
R - Medicine
1