Klassifikationsnummer
P - Language and Literature
42
E - United States History
35
T - Technology
31
H - Social Science
30
L - Education
13
D - World History
7
K - Law
6
F - General American History
5
J - Political Science
5
Q - Science
3
R - Medicine
3
Z - Library Science
3
B - Philosophy, Psychology, Religion
2
M - Music
2
C - Historical Sciences
1
G - Geography, Anthropology, Recreation
1
S - Agriculture
1
U - Military Science
1