(State of) Iowa Center for the Book, a program of the State Library (Des Moines), affiliated with the Library of Congress Center for the Book
Archive Finder, Home Page. Searchable subscription database of collections at 5,500 U.S. repositories, some British institutions, and Irish repositories. Search by keyword in collections or by repository. Includes links to online finding aids when available. Formerly "ArchivesUSA."
National Union Catalog of Manuscript Collections (NUCMC). Searchable database of U.S. manuscript collections reported to the Library of Congress. Records include descriptions and location of the collection, online access if available, and other information. Less friendly than ArchivesUSA but highly complementary.
Repositories of Primary Sources (University of Idaho). Links to 4800 institutional websites, U.S. and international, describing special collections holdings. Lists arranged by country, region, state, and general.
WorldCat / OCLC. Records for manuscripts, monographs, and all varieties of media. Now includes ArchiveGrid, a database of records and inventories created by RLG before its merger with OCLC. Search function can be limited to manuscripts. Cataloged manuscripts and manuscript collections are included; records provide information about the institution at which they are located. Subscription database available to UI users only.
The University of Iowa Collections Consortium. Links to museums and similar research collections and facilities at The University of Iowa.
The Atlas of Early Printing. An online, interactive tool for teaching and understanding the spread of printing from 1450-1500, developed by Special Collections & University Archives.