HD - Industries, Land Use, Labor 5,276
HF - Commerce 3,234
HM - Sociology 2,908
HV - Social Pathology, Criminology 2,420
HC - Economic History and Conditions 2,080
HQ - Family, Marriage, Women 2,078
HB - Economic Theory and Demography 1,995
H - Social Science 1,893
HG - Finance 1,200
HN - Social History and Conditions 1,022
HT - Communities, Classes, Races 779
HJ - Public Finance 480
HX - Socialism, Communism, Anarchism 249
HE - Transportation and Communications 240
HA - Statistics 90
HS - Societies 20