On sale date from the publication date found in the Catalog of Copyright Entries, Part 2, Periodicals, New Series, Volume 35, 1940, Number 2. Second class permit. Copyright number 453477.
HS suggests that perhaps Powell had some input here.
In the spirit of complete contrariety, this issue's cover lists this feature as "Gale Allen of the Women's Space Patrol."
Art credits verified via Rico interview in Alter Ego #114 (December 2012) and added by Craig Delich 2012-12-24.