On sale date from the publication date found in the Catalog of Copyright Entries, Part 2, Periodicals, New Series, Volume 34, 1939, Number 3. Second class permit. Copyright number 427714. Copyright given to Stephen Slesinger, Inc.
Adapts Edgar Rice Burroughs' "A Princess of Mars."
Script adaptation credit per Western's then policy per Oskar Lebeck cited by Michael Barrier, p. 28, Funnybooks (UC Press, Oakland, 2015). These credits continue until the strip was canceled.