When searching the Catalog, Prospector, and WorldCat, try to
Books on the same topic often have similar call numbers.
Once you find a good book in the stacks, browse the shelves for similar items.
For a complete list of call numbers by subject area, check out the Library of Congress Classification Outline.
Think Broadly. Remember to think broadly when searching for books - that is, to realize that your specific topic will probably be treated in books that cover a broader subject.
Once you find a book relevant to your topic, use the subject headings to help you find more.