[Postcard and notes calculating cost of trip found in European Trip Volume II], August 10, 1968 - June 29, 1970, Box: 1, Folder: 6. Barbara Burghart-Perreault collection, RH MS 1604. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/565351 Accessed January 13, 2025.