HD - Industries, Land Use, Labor 733,971
HC - Economic History and Conditions 378,342
HV - Social Pathology, Criminology 305,607
HQ - Family, Marriage, Women 261,479
HF - Commerce 243,172
HB - Economic Theory and Demography 223,685
HG - Finance 201,394
HN - Social History and Conditions 123,482
HE - Transportation and Communications 111,055
HT - Communities, Classes, Races 108,228
HM - Sociology 106,275
HX - Socialism, Communism, Anarchism 83,183
HJ - Public Finance 79,840
HA - Statistics 56,992
H - Social Science 42,007
HS - Societies 15,371
F - General American History 3
B - Philosophy 2
E - United States History 2
N - Visual Arts 2
NC - Drawing, Design, Illustration 1
PS - American Literature 1