Billy the Kid Adventure Magazine. New York: Toby Press, Inc., October 1950

Billy the Kid Adventure Magazine. New York: Toby Press, Inc., October 1950, Volume: Gilbert D114. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/525315 Accessed December 27, 2025.