Searching library catalogs for a particular genre may not give you a complete listing of film holdings in that genre. Why?
The Library of Congress only introduced genre/form subject headings in the late 1990s. As a result, not all catalog records in Diamond include this information. In addition, it took some time to develop the Library of Congress' complex system of genre headings. You can find an updated guide to genre/form headings here.
Alternately, you can browse lists of film by genre using the links accessible on the Genre tab above. Click the "INFO" link in the last column to access the catalog record for the film. Film genre information for these lists were based upon genre terms assigned in the Internet Movie Database.