Chicago Collections Consortium’s LibGuide for Archival Sources Relating to Chicago Newspapers provides a background on newspapers in Chicago, where to locate newspapers, general information on historical newspapers, and sources for further research.
The Chicago Public Library has a guide to their collection of newspaper accessible either in hardcopy, microfilm, or database via library card access.
Encyclopedia of Chicago entry on the history and impact Newspapers in Chicago.
University of Illinois provides A Brief History of Newspapers in Illinois and From the INP Archives: Women Diversifying Illinois Newspapers.
A Library of Congress guide to original and reprint newspapers
New York Newspaper Publishers Association’s glossary of newspaper terminology
The American Antiquarian Society collection of newspapers and periodicals.
The Library of Congress research guide for the Directory of U.S. Newspapers in American Libraries
Chronicling America Historic American Newspapers collection provides access to select digitized newspaper pages