Classification
P - Language and Literature
467
L - Education
67
T - Technology
29
F - General American History
6
M - Music
6
A - General Works
4
B - Philosophy, Psychology, Religion
4
R - Medicine
4
C - Historical Sciences
3
Z - Library Science
3
S - Agriculture
2
E - United States History
1
N - Fine Arts
1
Q - Science
1