HD - Industries, Land Use, Labor 11,547
HF - Commerce 4,519
HC - Economic History and Conditions 4,198
HB - Economic Theory and Demography 3,042
HG - Finance 2,847
HQ - Family, Marriage, Women 2,524
HV - Social Pathology, Criminology 2,456
HJ - Public Finance 2,363
HA - Statistics 1,874
HE - Transportation and Communications 1,821
HN - Social History and Conditions 1,222
HX - Socialism, Communism, Anarchism 936
HM - Sociology 710
HT - Communities, Classes, Races 637
H - Social Science 622
HS - Societies 205
TH - Building Construction 3
LB - Theory and Practice of Education 2
DS - Asia 1
E - United States History 1