HD - Industries, Land Use, Labor 3,569
HF - Commerce 1,983
HG - Finance 839
HC - Economic History and Conditions 348
HB - Economic Theory and Demography 314
HT - Communities, Classes, Races 223
HJ - Public Finance 169
HM - Sociology 140
HQ - Family, Marriage, Women 137
HA - Statistics 101
H - Social Science 97
HV - Social Pathology, Criminology 92
HN - Social History and Conditions 66
HE - Transportation and Communications 45
HS - Societies 4
HX - Socialism, Communism, Anarchism 4