HD - Industries, Land Use, Labor 5,687
HQ - Family, Marriage, Women 5,401
HV - Social Pathology, Criminology 3,963
HC - Economic History and Conditions 2,361
HF - Commerce 1,577
HM - Sociology 1,464
HN - Social History and Conditions 1,381
HT - Communities, Classes, Races 1,281
HG - Finance 1,231
HB - Economic Theory and Demography 1,113
HX - Socialism, Communism, Anarchism 776
HJ - Public Finance 516
HE - Transportation and Communications 483
H - Social Science 270
HA - Statistics 145
HS - Societies 64