Directory describing over 200,000 collections of primary source material housed in thousands of repositories across the United States, the United Kingdom and Ireland. Archive Finder integrates finding aids containing detailed indexes and descriptions for special and historical collections into comprehensive collection records. The database includes the following sources for locating archives: ArchivesUSA which contains the entire collection of NUCMC from 1959 to 2006. The National Union Catalog of Manuscript Collections (NUCMC) includes information gathered and indexed by the Library of Congress, covering more than 106,000 collections. Names and detailed subject indexing of over 65,000 collections whose finding aids have been published separately in ProQuest UMI's microfiche series, National Inventory of Documentary Sources in the United States (NIDS). Names and detailed subject indexing of over 44,500 collections whose finding aids have been published separately in ProQuest UMI's microfiche series, National Inventory of Documentary Sources in the United Kingdom and Ireland (NIDS UK/Ireland). Collection descriptions submitted directly from repositories. A growing number of more than 6,000 links to online finding aids.