Population Growth and Energy Conservation - statement of M. King Hubbert to sub-committee on the Environment of the Committee on Interior and Insular Affairs of the House of Representatives, Box: 5, Folder: 37. Wallace E. Pratt papers, RH MS 870. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/34111 Accessed November 24, 2024.