"The Galapagos: Evolution of Orsilline Insect Faunas on Oceanic Islands (Hempitera, Lygaeidae)" by Usinger, Robert L. and Ashlock, Peter, 1966, Box: 1, Folder: 22. Personal papers of Peter D. Ashlock, PP 515. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/394865 Accessed May 03, 2024.