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Subclass H: Social Sciences (General)
Subclass HB: Economic Theory. Demography
Subclass HC: Economic History
Subclass HD: Industries. Land Use. Labor
HD28-70: Management
HD101-1395: Land use
HD1401-2210: Agriculture
HD2321-4730: Industry
HD4801-8943: Labor. Working class
HD9000-9999: Special industries and trades
Subclass HE: Transportation and Communications
Subclass HJ: Public Finance
Subclass HM: Sociology (General)
Subclass HN: Social History and Conditions. Social Problems. Social Reform
Subclass HQ: The Family. Marriage. Women
HQ12-472: Sexuality
HQ503-1064: The family. Marriage. Home
HQ1075: Sex role
HQ1088-1090: Men
HQ1101-2030: Women. Feminism
Subclass HS: Secret Societies
Subclass HT: Communities. Classes. Races
HT101-395: Urban groups
HT401-485: Rural groups
HT601-1445: Classes
HT680-690: Middle class
For Working class, see HD4841+; HD4901
HT851-1444: Slavery
HT1501-1595: Races
Subclass HV: Crime. Social and public welfare. Poverty
HV85-525: By region or country
HV553-639: Relief in case of emergencies
HV640-645: Refugee problems
HV697-4959: Protection, assistance, and relief
HV701-1420: Children
HV1551-3024: People with disabilities
HV4023-4470: Urban poor. Slums
HV4701-4890: Animal welfare
HV5001-5720: Alcoholism. Temperance reform
HV5800-5840: Drug use
HV6001-7220: Crime
HV7231-9960: Criminal justice
Subclass HX: Socialism. Communism. Anarchism