By Space Ship to Saturn or Exploring the Ringed Planet

From Author Wars - https://authorwars.com/publications/by-space-ship-to-saturn-or-exploring-the-ringed-planet-428513.html

Overview:

Title: By Space Ship to Saturn or Exploring the Ringed Planet
Author: Roy Rockwood
Year: 1942
Publisher: Whitman Publishing Company
Pages: 203
Binding: Hardcover
Type: Novel
Title Reference: By Space Ship to Saturn or Exploring the Ringed Planet
Notes:
- Whitman "Great Marvel Series" reprint. No date on book or dust jacket other than 1935 copyright by Cupples & Leon. 11 titles on back of dust jacket, all published 1941 or 1942, so this edition was very likely published in 1942. Per http://seriesbookcentral.bobfinnan.com/gms.htm and ABE booksellers, Whitman published this Roy Rockwood reprint series in "the late 30's or early 40's".
- No credit on book or jacket for cover art, but there is a clearly visible signature "J Chambers" which matches examples of Jim Chambers signature at http://www.pulpartists.com/Chambers.html.
- No price on book or dust jacket.