Cover story. Writer and art credits confirmed from Julius Schwartz's editorial records, provided by DC Comics.
in DC Special (DC, 1968 series) #3 (April-June 1969)
in Fantomet (Bonnier Publications / Semic, 1995 series) #16/1997 (uke 32 1997)
in Pulp Fiction Library: Mystery in Space (DC, 1999 series) #[nn] ([September] 1999)Writer and art credits confirmed from Julius Schwartz's editorial records, provided by DC Comics.
Story page credits a 'Robert Starr' which was a pseudonym Julius Schwartz used to make it look like he had more writers. Bob Hughes via email.
in GrĂ¼ne Laterne (BSV - Williams, 1975 series) #8 (Mai 1976)Writer and art credits confirmed from Julius Schwartz's editorial records, provided by DC Comics.
in From Beyond the Unknown (DC, 1969 series) #18 (August-September 1972)Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (April 2007).