Books are shelved in general subject categories using the Library of Congress classification system. You may want to supplement your use of the catalog book search with browsing shelf areas for your topic.
Books on Sociology are shelved on the library's upper level within the H section.
Matereials within the H classification area deal with Social Sciences in general.
For Specific Areas that Might Pertain to Your Research, You Should Browse These Areas:
H Social Sciences - General
HN Social history, social problems, social reform
HQ The family. Marriage. Women
HT Communities, classes, races
HV Social pathology; social and public welfare; criminology
Image from: Andrew Hope (2008)
This link shows how to read a call number.
from Oviatt Library at California State University, Northridge: http://library.csun.edu/ResearchAssistance/LCC
The classification system is in many ways out of date and shows relationships that now see odd and even offensive. (Why put books about women as a subset after "family"? Seriously?) Like all social constructs, it reflects a particular context and perspective. Be prepared to outwit it and browse - even if the arrangement seems weird, you will often find books shelved together that make browsing helpful. There's an outline available of the Library of Congress system, the one we use. (If you think that's bad, Dewey Decimal is even worse.)