HD - Industries, Land Use, Labor 5,723
HQ - Family, Marriage, Women 5,463
HV - Social Pathology, Criminology 4,012
HC - Economic History and Conditions 2,381
HF - Commerce 1,578
HM - Sociology 1,490
HN - Social History and Conditions 1,392
HT - Communities, Classes, Races 1,308
HG - Finance 1,234
HB - Economic Theory and Demography 1,120
HX - Socialism, Communism, Anarchism 780
HJ - Public Finance 520
HE - Transportation and Communications 486
H - Social Science 273
HA - Statistics 147
HS - Societies 65