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.
In addition to conducting keyword searches in UC Library Search, researchers can also use Library of Congress subject headings to search books and other resources. Below are some examples: