"Rocketship X-M"

From Author Wars - https://authorwars.com/books/rocketship-x-m-128762.html

Overview:

Title: "Rocketship X-M"
Author: Leslie Phelps
Year: 1950
Type: Essays

Editions/Publications:

Unknown. Amazing Stories, December 1950 (Unknown, Leslie Phelps, Ziff-Davis Publishing Company, $0.25, 164 pages, pulp, MAGAZINE)
Unknown. Amazing Stories, #10 (Unknown, Leslie Phelps, Thorpe & Porter, 2/-, 132 pages, pulp, MAGAZINE)