On sale date from the publication date found at the Catalog of Copyright Entries, Part 2, Periodicals, New Series, Volume 35, 1940, Number 2. Second class permit. Copyright number 449439.
First line of text reads: "Space" and Dianna are returning to Earth after a trip to red planet." [sic]
Writer and letterer credits added by Craig Delich 2010-3-13. Credits corrected 12 June 2016.