Correspondence with Governor Warren E. Hearnes regarding Missouri delegation and visit to Washington, March 3, April 20, 1971, Box: 1, Page: 104-107. The Dr. David A. Otto, Special Envoy for the Missouri State Teachers Association during the time of the 1971 Paris Peace Talks, collection, RH MS 1257. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/32513 Accessed June 01, 2024.