Otto, Dr. David to H. Ross Perot and Murphy Martin regarding Missouri delegation, March 3, 1971, Box: 1, Page: 108-109. 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/32514 Accessed June 13, 2024.