Agenda: new proposals for assisting developing countries, special natural resources advisory services, and activities in petroleum and natural gas, coal, oil, shale, uranium, geothermal, solar, and electric power, February 1-5, 1971, Box: 23, Folder: 1. Charles Heller papers, RH MS 314. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/493194 Accessed April 26, 2024.