A - General Works 6,969
B - Philosophy, Psychology, Religion 102,924
C - Historical Sciences 5,951
D - World History 66,863
E - United States History 185,210
F - General American History 15,708
G - Geography, Anthropology, Recreation 18,631
H - Social Science 110,611
J - Political Science 26,409
K - Law 20,066
L - Education 22,337
M - Music 92,433
N - Fine Arts 63,919
P - Language and Literature 165,514
Q - Science 62,237
R - Medicine 32,837
S - Agriculture 8,620
T - Technology 30,834
U - Military Science 4,844
V - Naval Science 1,645
Z - Library Science 5,493
HD - Industries, Land Use, Labor 22,119
HV - Social Pathology, Criminology 13,594
HQ - Family, Marriage, Women 13,284
HF - Commerce 12,170
HC - Economic History and Conditions 9,730
HM - Sociology 7,481
HG - Finance 7,028
HB - Economic Theory and Demography 6,502
HT - Communities, Classes, Races 5,360
HN - Social History and Conditions 4,649
HX - Socialism, Communism, Anarchism 2,154
HE - Transportation and Communications 1,812
HJ - Public Finance 1,647
H - Social Science 1,557
HA - Statistics 605
HS - Societies 222