Photographs of Plains Butadiene Plant; a plant incorporating Phillips processes and designed, built and operated by Phillips Petroleum Company for the National Synthetic Rubber Program of World War II, by Stanley Learned, Box: 1, item: 7. Stanley Learned Collection, RH MS 831. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/106758 Accessed April 27, 2024.