Typescript and drawings regarding radial vortice trains (in looseleaf binder labeled 'Suction Plate Notes, 2-28-77"), Box: 9, Folder: 20. Russell Randolph Hays papers, RH MS 564. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/278253 Accessed November 23, 2024.