HD - Industries, Land Use, Labor 5,779
HQ - Family, Marriage, Women 5,527
HV - Social Pathology, Criminology 4,049
HC - Economic History and Conditions 2,392
HF - Commerce 1,577
HM - Sociology 1,519
HN - Social History and Conditions 1,402
HT - Communities, Classes, Races 1,310
HG - Finance 1,236
HB - Economic Theory and Demography 1,127
HX - Socialism, Communism, Anarchism 783
HJ - Public Finance 520
HE - Transportation and Communications 489
H - Social Science 276
HA - Statistics 145
HS - Societies 66