If you like to browse the bookshelves, some general call numbers to help you locate books by broad topics are:
Keyword
Subject
Author
Title
Reference material can be very useful for finding broad overviews on a topic:
A collection of onine reference material that covers sociology, social work, multicultural and gender studies,political science, psychology, anthropology, criminal justice, health & medicine. Main page allows for searching across all titles and subjects in the collection.