Locating relevant books in the online catalog with be more effective if you can refine your topic area. The primary call number ranges for Sociology/Anthropology are:
GN: Cultural Anthropology
GT: Manners and Customs
HN: Social history and conditions. Social problems. Social reform.
HQ: The family. Marriage. Women
HS: Societies: secret, benevolent, etc.,
HT: Communities, Classes, Races
HX: Socialism. Communism. Anarchism