Updated annually. Directory of archives and manuscript collections in the United States with descriptions of a repository's holdings. Repository records include phone and fax numbers, hours of service, materials solicited, email and home page URLs when available. Each collection record links to its corresponding repository record. Integrates records from NUCMC (National Union Catalog of Manuscript Collections), 1959-1995; NIDS (National Inventory of Documentary Sources in the United States); and Directory of Archives and Manuscript Repositories in the United States (1996).