Library of Congress Online Catalogs 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. The Library of Congress Online Catalog contains records for 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. The Catalogs page describes and links to four methods for searching these catalogs. The Library provides access to its catalogs using both fill-in forms and commands. Each method provides different search and help features. In some instances the catalog information also provides links to digitized works.
