HD - Industries, Land Use, Labor 5,876
HF - Commerce 4,000
HC - Economic History and Conditions 2,831
HM - Sociology 2,652
H - Social Science 2,145
HB - Economic Theory and Demography 2,087
HV - Social Pathology, Criminology 2,036
HQ - Family, Marriage, Women 1,817
HG - Finance 1,384
HN - Social History and Conditions 984
HT - Communities, Classes, Races 722
HJ - Public Finance 506
HE - Transportation and Communications 381
HX - Socialism, Communism, Anarchism 312
HA - Statistics 123
HS - Societies 18