Civil action - "U.S.A. versus five oil companies: Standard Oil (New Jersey), Standard Oil (California), Texaco, Socony-Vacuum, Gulf Oil", Box: 18, Folder: 17. Charles Heller papers, RH MS 314. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/490448 Accessed February 26, 2025.