"Petroleum marketing operations: restatement of revenues, costs, and profits" by Peat, Marwick, Mitchell, and Co., 1970, Box: 5, Folder: 31. Charles Heller papers, RH MS 314. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/489338 Accessed April 23, 2024.