HD - Industries, Land Use, Labor 96.847
HB - Economic Theory and Demography 62.231
HC - Economic History and Conditions 48.784
HF - Commerce 40.084
HV - Social Pathology, Criminology 36.417
HQ - Family, Marriage, Women 35.914
HG - Finance 31.899
HM - Sociology 23.482
HN - Social History and Conditions 17.613
HT - Communities, Classes, Races 14.851
HX - Socialism, Communism, Anarchism 12.580
HE - Transportation and Communications 10.026
H - Social Science 8.220
HJ - Public Finance 7.943
HA - Statistics 3.150
HS - Societies 1.719