The National Archives may be able to assist you. Here’s their contact information.

National Archives and Records Administration
http://www.archives.gov/
700 Pennsylvania Avenue, NW
Washington, DC 20408-0001
(866) 272-6272

or

Acquisitions Section, Newspapers and Periodicals Wisconsin Historical Society
816 State Street
Madison, Wisconsin  53706-1482
(608) 264-6598
Wisconsin Historical Society ([email protected])