HD - Industries, Land Use, Labor 493
HC - Economic History and Conditions 281
HF - Commerce 269
HB - Economic Theory and Demography 215
HQ - Family, Marriage, Women 204
HG - Finance 164
HV - Social Pathology, Criminology 138
HM - Sociology 110
HN - Social History and Conditions 99
H - Social Science 73
HT - Communities, Classes, Races 73
HJ - Public Finance 25
HA - Statistics 21
HE - Transportation and Communications 13
HX - Socialism, Communism, Anarchism 6