Letters to Richard Walker regarding stock information, 1951-1952, 1954-1955, 1975, 1978, 1981, Box: 9, Folder: 23. Records of Microwave Associates, RH MS 601. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/283411 Accessed May 18, 2024.