Cupid, John G. (Secretary, Commission of Inquiry-Marketing Petroleum Products) - P.S. Ministry of Petroleum, 1965 - 1966, Box: 9, Folder: 23. Charles Heller papers, RH MS 314. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/489862 Accessed July 26, 2024.