Tools: Advanced Search
If you don't find your topic in the Subject search, try your terms as searches instead. A Keyword search will also pick up books that have a chapter on your topic. For example, there is no subject heading in Marqcat for ethnic heterogeneity. But if you do a keyword search, you will find many books. Or you can connect concepts, such as the "crime families." Again, many books come up. If you find a book that is dead on, check its subject headings for more books on that topic.
For e-books on a particular topic use the Advanced Search Mode,
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Click on book title/cover for more information including nearby libraries with the book. If the book is out of copyright and in the public domain, the full text can be viewed.