Originally published in magazine form in ADVENTURE COMICS (Vol. 1) #300, September 1962.
All Rights reserved to DC Comics.
Reprinted in ACTION COMICS (Vol. 1) #377, June 1969; in ADVENTURE COMICS DIGEST (Vol. 1) #497, March 1983; in LEGION OF SUPER-HEROES ARCHIVES Volume One, 1991; & in SHOWCASE PRESENTS: LEGION OF SUPER-HEROES, Vol. 1, April 2007.
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