HD - Industries, Land Use, Labor 11,489
HF - Commerce 4,495
HC - Economic History and Conditions 4,139
HB - Economic Theory and Demography 3,029
HG - Finance 2,845
HQ - Family, Marriage, Women 2,471
HV - Social Pathology, Criminology 2,440
HJ - Public Finance 2,362
HA - Statistics 1,872
HE - Transportation and Communications 1,816
HN - Social History and Conditions 1,190
HX - Socialism, Communism, Anarchism 933
HM - Sociology 702
H - Social Science 609
HT - Communities, Classes, Races 604
HS - Societies 205
TH - Building Construction 3
LB - Theory and Practice of Education 2
DS - Asia 1
E - United States History 1