Mark Trail; The Magazine of Adventure for Boys. Minneapolis, Minn.: Wret Publishing Company, Spring 1951

Mark Trail; The Magazine of Adventure for Boys. Minneapolis, Minn.: Wret Publishing Company, Spring 1951, Volume: Gilbert D616. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/526635 Accessed December 27, 2025.