Klassifikationsnummer
D - World History
34
E - United States History
14
P - Language and Literature
13
F - General American History
12
H - Social Science
7
C - Historical Sciences
6
G - Geography, Anthropology, Recreation
2
L - Education
2
A - General Works
1
B - Philosophy, Psychology, Religion
1
K - Law
1
N - Fine Arts
1