"Petroleum price and crisis, 1971: Oil demand, supply, cost, and price in the world market" by Professor M. A. Adelma, 1971, Box: 23, Folder: 22. Charles Heller papers, RH MS 314. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/493217 Accessed April 19, 2024.