Through Space to Mars or the Longest Journey on Record

From Author Wars - https://authorwars.com/publications/through-space-to-mars-or-the-longest-journey-on-record-428500.html

Overview:

Title: Through Space to Mars or the Longest Journey on Record
Author: Roy Rockwood
Year: 1942
Publisher: Whitman Publishing Company
Pages: 248
Binding: Hardcover
Type: Novel
Title Reference: Through Space to Mars or the Longest Journey on Record
Notes:
- Whitman "Great Marvel Series" reprint. No date on book or dust jacket other than 1910 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.