Wilber Underhill "Tri-State Terror", ring leader, killed detective Merle Clover of Wichita. Was shot to death in Shawnee, Oklahoma, Box: 1, item: 4. Devil's Front Porch, with editorial proof markings, RH MS 131. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/3190 Accessed April 24, 2024.