A directory of repositories and collections of primary source material across the United States and the United Kingdom; it includes the entire National Union Catalog of Manuscript Collections (NUCMC).

Contains descriptions of collections from thousands of libraries, museums, and archives worldwide.

The most comprehensive finding list available of previously uncatalogued or incompletely catalogued Renaissance humanistic manuscripts in libraries and collections all over the world.

Guides provide a gateway to the Library of Congress collections. Links are provided to digitized content, when available.

A good starting point / overview of doing research at the U.S. National Archives.

A database listing materials, including archival and manuscript materials, from thousands of different libraries.

Includes repositories in Washington, Oregon, Idaho, Montana, Utah, and Alaska.

Descriptions of archival collections, preserved and made accessible by Arizona repositories.

Access to over 1,000,000 resources from universities, colleges, public libraries, museums, historical societies, and government agencies, counties, and municipalities in Utah, Nevada, Idaho, Oregon, Hawaii, Wyoming and other parts of the U.S. West.

Access to finding aids for archival collections from 19 repositories across the state of New Mexico.

More than 200 contributing institutions.

Descriptions of the rich archival, manuscript, and museum collections in repositories across the state available to the public.