USDA, Progress report for 1953 on Toxicological Effects of Insecticides, Fungicides and Herbicides on Plants and Animals, November 5, 1953, Box: 26, Folder: 51. Frank A. Theis papers, RH MS 948. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/61062 Accessed July 11, 2025.