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HD - Industries, Land Use, Labor 118,531
HC - Economic History and Conditions 60,021
HV - Social Pathology, Criminology 56,911
HQ - Family, Marriage, Women 49,440
HF - Commerce 42,617
HE - Transportation and Communications 38,242
HG - Finance 30,831
HB - Economic Theory and Demography 21,311
HN - Social History and Conditions 20,362
HM - Sociology 17,698
HT - Communities, Classes, Races 17,247
HX - Socialism, Communism, Anarchism 12,145
HJ - Public Finance 9,059
H - Social Science 7,216
HA - Statistics 5,736
HS - Societies 4,819