You will find books on social sciences in these sections:
Subclass H Social sciences (General)
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
For more help using Library of Congress call numbers, see this guide from Northwestern University.
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