Klassifikationsnummer
N - Fine Arts
458
P - Language and Literature
13
M - Music
6
D - World History
5
L - Education
5
S - Agriculture
5
A - General Works
4
F - General American History
4
T - Technology
4
C - Historical Sciences
2
E - United States History
2
H - Social Science
2
G - Geography, Anthropology, Recreation
1
R - Medicine
1