Subclass H - Social Sciences (General).
Subclass HA - Statistics.
Subclass HB - Economic theory, Demography.
Subclass HC - Economic history and conditions.
Subclass HD - Industries. Land use. Labor.
Subclass HE - Transportation and communication.
Subclass HF -Commerce.
Subclass HG - Finance.
Subclass HJ - Public finance.
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Subclass HM - Sociology (General).
Subclass HN - Social History and conditions. Social problems. Social reform.
Subclass HQ - The family. Marriage. Women.
Subclass HS - Societies: secret, benevolent, etc.
Subclass HT - Communities. Classes. Races.
Subclass HV - Social pathology. Social and public welfare. Criminology.
Subclass HX - Socialism. Communism. Anarchism.
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