Academic libraries organize physical books using the Library of Congress Classification Outline.This is how you find a book in the library.
The classification system produces a "call number" on each book - an alphabetical and numerical sequence which locates a specific book on the shelf. More about understanding Library of Congress call numbers.
This system clusters books together by topic. If you know the call number range for a particular topic you are resarching (even if you don't find exactly what you are looking for in the catalog) browsing the shelves can often lead you to other, similar books.
Library of Congress call numbers covering sociological aspects of family, marriage, and women are under HQ.
While eBooks (online books) may come up in a general search of the Library Catalog, you can also search individual eBook databases to find online books that precisely match your topical search terms. In addition, you can browse by subject, as well as search within a subject.