סימן המיקום
E - United States History
31,112
F - General American History
5,074
P - Language and Literature
4,425
M - Music
2,486
L - Education
843
G - Geography, Anthropology, Recreation
700
H - Social Science
700
C - Historical Sciences
587
U - Military Science
519
B - Philosophy, Psychology, Religion
455
Z - Library Science
428
K - Law
402
J - Political Science
342
A - General Works
285
S - Agriculture
162
R - Medicine
161
N - Fine Arts
137
D - World History
113
T - Technology
86
V - Naval Science
85
Q - Science
9