HD - Industries, Land Use, Labor 737,753
HC - Economic History and Conditions 380,059
HV - Social Pathology, Criminology 307,649
HQ - Family, Marriage, Women 263,685
HF - Commerce 244,360
HB - Economic Theory and Demography 224,701
HG - Finance 201,126
HN - Social History and Conditions 124,263
HE - Transportation and Communications 111,517
HT - Communities, Classes, Races 109,022
HM - Sociology 107,143
HX - Socialism, Communism, Anarchism 83,615
HJ - Public Finance 80,143
HA - Statistics 57,227
H - Social Science 42,224
HS - Societies 15,440
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