The Library of Congress collections include over 110 million
items in a variety of formats and languages. The catalog information for many of these items has
appeared in a number of traditional card catalogs located in the Library. Much of the information
in these catalogs is also searchable over the Internet. This page links to the two methods for search the main Library of Congress Online Catalog and to several specialized catalogs for prints and photographs (PPOC), for sound recordings (SONIC) and a Z39.50 gateway to the main catalog data.