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(Amazing, June 1928)
(Amazing, November 1929)
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(Analog (Astounding), March 1931).
(Amazing, April 1931)
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(Analog (Astounding), September 1931)
(Analog (Astounding), January 1932)
(Analog (Astounding), June 1932)
(Analog (Astounding), March 1933)
(Amazing, September 1934)
(Analog (Astounding), January 1940)
(Analog (Astounding), February 1940)
(Comet, January 1941)