For Your Information: Max Valier and the Rocket-Propelled Airplane
From Author Wars - https://authorwars.com/books/for-your-information-max-valier-and-the-rocket-propelled-airplane-780421.html
Overview:
Editions/Publications:
- Unknown. Galaxy Magazine, May 1969 (Unknown, Willy Ley, Galaxy Publishing Corporation, $0.60, 196 pages, digest, MAGAZINE)