(Analog (Astounding), July 1939)
.
(Analog (Astounding), April 1942).
(Analog (Astounding), October 1942).
(Analog (Astounding), September 1943).
(Analog (Astounding), October 1943).
(Analog (Astounding), January 1945).
(Analog (Astounding), May 1946).
(Analog (Astounding), August 1946).
(Analog (Astounding), December 1946).
(Analog (Astounding), April 1947).
(Analog (Astounding), December 1947).
(Analog (Astounding), April 1950).
(Baen, 2006)
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