Bound typescript (cover title: "Wind Rotor; specifications and design data") with drawings, offprints, tear sheets, and black and white photographs]. Compiled July 1, 1945, Box: 7, Folder: 4. Russell Randolph Hays papers, RH MS 564. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/278193 Accessed May 04, 2024.