HD - Industries, Land Use, Labor 26,060
HQ - Family, Marriage, Women 20,359
HV - Social Pathology, Criminology 17,781
HC - Economic History and Conditions 12,532
HF - Commerce 12,126
HG - Finance 8,851
HM - Sociology 8,475
HB - Economic Theory and Demography 7,800
HN - Social History and Conditions 6,048
HT - Communities, Classes, Races 5,266
HJ - Public Finance 3,795
H - Social Science 3,102
HX - Socialism, Communism, Anarchism 2,546
HE - Transportation and Communications 2,235
HA - Statistics 716
HS - Societies 222