Petroleum policy - memorandum for the president (on the proposals to exempt asphaltic content of imported oil), 1963

Petroleum policy - memorandum for the president (on the proposals to exempt asphaltic content of imported oil), 1963, Box: 18, Folder: 40. Charles Heller papers, RH MS 314. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/490470 Accessed December 25, 2025.