If you're interested in a broad topic in Gender Studies, or would like to browse for inspiration, try one of these Library of Congress call letters:
For more literature-oriented books at Collins Library, you can find some of them in the PS 153 ranges, which focus on the literature of specific groups, including:
Locations of books
Use Google Books to search the text of a book.
Collins Library, like most academic libraries in the United States, uses Library of Congress Subject Headings to describe the content of books. In many ways, subject headings are a form of tagging, in that they represent the content of the material and provide ways for you to efficiently locate more materials that are conceptually related.
Subject headings tend to lag behind terminology used today, meaning some subject headings may be outdated or considered incorrect. See QueerLCSH for a comprehensive list of Library of Congress subject headings. Keep in mind other databases may use different subject terms.