Klassifikationsnummer
Q - Science
217
G - Geography, Anthropology, Recreation
47
H - Social Science
19
S - Agriculture
14
T - Technology
14
B - Philosophy, Psychology, Religion
13
A - General Works
3
D - World History
2
R - Medicine
2
E - United States History
1
F - General American History
1
J - Political Science
1
L - Education
1
N - Fine Arts
1
P - Language and Literature
1