The United States Newspaper Project (USNP) was created to microfilm extant copies of US newspapers and make them available to researchers.

The USNP is a co-venture of the Library of Congress and the "National Endowment for the Humanities®", with projects in all of the states and US Districts/Territories.

The list of state and national repositories can be view from the link below. You can do a google search to find more information.