Archives USA is a current directory of 5,596 repositories and 154,678 collections of primary source material across the United States. Using Archives USA, researchers can read descriptions of holdings of repositories to determine whether a collection contains material relevant to their work as well as find the information they need to contact the repository directly. C19 Index contains 61,647 records detailing the collections and repositories in the United States that hold 19th century research materials. Part of C19 database. No full text. [more]