Browsing books in the library can help you uncover some gems.
Books are grouped by subject, and you can use the Library of Congress Classification Outline to figure out the call numbers for your subject, then find where the call numbers are located in the library building.
Since books on your subject will likely be located together, you can also search the catalog Library Search to find a few books on your topic, then browse the shelves around that book to find other books on your topic.