A catalog of books and materials at libraries worldwide. Try searching here to find ALL books available on a topic. Materials available at Thomason Library will have Presbyterian College listed in locations and others can be searched in PASCAL or borrowed through Interlibrary Loan.
Try a keyword search. Once you find a book that is relevant to your topic, use the subject headings listed in the catalog record for that book to help you find "more like this".
Some examples of Library of Congress Subject Headings that might be helpful follow: