Originally published in magazine form in ADVENTURE COMICS (Vol. 1) #371, August 1968.All Rights reserved to DC Comics.
Reprinted in BEST OF DC DIGEST (Vol. 1) #24, May 1982; in LEGION OF SUPER-HEROES ARCHIVES Volume Eight, 1998; & in SHOWCASE PRESENTS: LEGION OF SUPER-HEROES, Vol. 4, October 2010.
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