HD - Industries, Land Use, Labor 730,895
HC - Economic History and Conditions 376,910
HV - Social Pathology, Criminology 304,039
HQ - Family, Marriage, Women 259,795
HF - Commerce 242,095
HB - Economic Theory and Demography 222,258
HG - Finance 200,563
HN - Social History and Conditions 122,979
HE - Transportation and Communications 110,598
HT - Communities, Classes, Races 107,728
HM - Sociology 105,731
HX - Socialism, Communism, Anarchism 82,687
HJ - Public Finance 79,579
HA - Statistics 56,916
H - Social Science 41,818
HS - Societies 15,284
F - General American History 3
E - United States History 2
N - Visual Arts 2
B - Philosophy 1
NC - Drawing, Design, Illustration 1
PS - American Literature 1