This bibliography is the first to provide systematic coverage of the numerous guides, directories, calendars, inventories, and registers on archives and manuscript collections in the United States. It also covers guides to foreign archives holding materials crucial to an understanding of U.S. history and extends beyond the continential United States to include archives in Puerto Rico, the Virgin Islands, and other Trust Territories. Cutting across disciplines, this bibliography cites more than 2,000 titles from the humanities and the social and physical sciences. It also includes guides to the voluminous holdings of the federal government. The entries are arranged in both topical and geographical headings. Annotations are designed to clarify a guide’s title and to help researchers to ascertain the guide’s usefulness to them. The index will help researchers to locate quickly guides to the holdings that will be most useful to them. This volume will be a valuable tool for scholars and researchers using unpublished sources as well as for librarians.