Energy - "Needs and oil matters: the oil import program of the U. S." by E. H. Shaffer and "An analysis of the U.S. oil import quota" by James C. Burrows and Thomas A. Domenchich, Box: 18, Folder: 24. Charles Heller papers, RH MS 314. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/490455 Accessed April 24, 2024.