HA1-4737 Statistics
HB1-3840 Economic Therory. Demography
HC10-1085 Economic History and Conditons
HD28-9999 Industries. Land Use. Labor
HE1-9990 Transportation and Communications
HF1-6182 Commerce
HG1-9999 Finance
HJ9-9940 Public Finace
HM(1)-1281 Sociology
HN1-995 Social History and Conditions. Social Problems. Social Reform
HT51-1595 Communities. Classes. Races
HV1-9960 Social Pathology. Social and Public Welfare. Criminology
HX1-970.7 Socialism. Communism. Anarchism.