The basics of finding newspapers at UIUC Library
The basics of locating and using microforms at UIUC Library
Catalog of Digital Historical Newspapers (identifies digitized newspapers from the United States and Caribbean countries)
Rowell's American Newspaper Directory (1869-1877)
Ayer's American Newspaper Annual (1880-1909)
Ayer's American Newspaper Annual & Directory (1910-1922)
Both Rowell's and Ayer's attempt to provide annual, comprehensive circulation and publication information for U.S. newspapers.A union list of extant United States newspapers in American libraries, museums, and historical societies.