The on-sale date is from the publication date recorded in the Catalog of Copyright Entries, Part 2, Periodicals, 1941, New Series, Vol. 36, No. 3.
much of this story is Hercules's dream
Writer revision from ? to Toni Blum by Craig Delich 2013-12-30. The Who's Who indicates that Toni Blum wrote this feature in 1941-42.
Artist verification for Williams by the Who's Who.