HD - Industries, Land Use, Labor 6,111
HM - Sociology 3,605
HF - Commerce 3,503
HV - Social Pathology, Criminology 2,915
HQ - Family, Marriage, Women 2,450
HC - Economic History and Conditions 2,370
H - Social Science 2,321
HB - Economic Theory and Demography 2,207
HG - Finance 1,245
HN - Social History and Conditions 1,157
HT - Communities, Classes, Races 962
HJ - Public Finance 582
HX - Socialism, Communism, Anarchism 331
HE - Transportation and Communications 283
HA - Statistics 97
HS - Societies 23