WorldCat is a union catalog that searches across the collections of many libraries both in the U.S. and worldwide. There is both a subscription version of the catalog from FirstSearch, as well as a freely available web version. However, WorldCat does not list the holdings of all international collections and archives, so researchers are encouraged to also explore the individual catalogs and finding aids of relevant institutions.
Searching Library of Congress standardized subject headings can help you find books on specific countries/regions, directors, and genres in UC Library Search. Some examples are provided below, and researchers are encouraged to click on subject headings in individual catalog records that are relevant to their topic.