(Methuen, 1922)
(Argosy, October 1922)
(McClurg & Co., 1930)
.
(Analog (Astounding), March 1930)
.
(Analog (Astounding), March 1931).
.
(Analog (Astounding), December 1931)
(Analog (Astounding), February 1932)
(Amazing, July 1942)
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