Richard Walker - Book chapter manuscript, "Rigid Transmission Lines, I Coaxial Lines, Chapter 4A, G. L. Ragan", 1946, Box: 11, Folder: 27. Records of Microwave Associates, RH MS 601. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/283461 Accessed May 18, 2024.