An Informal Letter To The Friends Of The Inner Sanctum. New York: Simon and Schuster, February 28, 1935

An Informal Letter To The Friends Of The Inner Sanctum. New York: Simon and Schuster, February 28, 1935, Volume: Gilbert D507. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/526285 Accessed December 27, 2025.