A - General Works 6,947
B - Philosophy, Psychology, Religion 101,291
C - Historical Sciences 5,775
D - World History 65,731
E - United States History 183,717
F - General American History 15,302
G - Geography, Anthropology, Recreation 18,208
H - Social Science 108,286
J - Political Science 25,861
K - Law 19,556
L - Education 21,811
M - Music 91,681
N - Fine Arts 61,355
P - Language and Literature 160,138
Q - Science 61,256
R - Medicine 32,279
S - Agriculture 8,335
T - Technology 30,106
U - Military Science 4,763
V - Naval Science 1,636
Z - Library Science 5,355
HD - Industries, Land Use, Labor 21,640
HV - Social Pathology, Criminology 13,257
HQ - Family, Marriage, Women 12,943
HF - Commerce 11,996
HC - Economic History and Conditions 9,578
HM - Sociology 7,300
HG - Finance 6,934
HB - Economic Theory and Demography 6,337
HT - Communities, Classes, Races 5,246
HN - Social History and Conditions 4,536
HX - Socialism, Communism, Anarchism 2,114
HE - Transportation and Communications 1,778
HJ - Public Finance 1,624
H - Social Science 1,496
HA - Statistics 599
HS - Societies 220