HD - Industries, Land Use, Labor 5,708
HQ - Family, Marriage, Women 5,444
HV - Social Pathology, Criminology 3,994
HC - Economic History and Conditions 2,376
HF - Commerce 1,577
HM - Sociology 1,479
HN - Social History and Conditions 1,389
HT - Communities, Classes, Races 1,295
HG - Finance 1,232
HB - Economic Theory and Demography 1,123
HX - Socialism, Communism, Anarchism 777
HJ - Public Finance 518
HE - Transportation and Communications 486
H - Social Science 271
HA - Statistics 146
HS - Societies 65