Marsrätsel gelöst — Der rote Planet hat doch Kanäle!
From Author Wars - https://authorwars.com/books/marsratsel-gelost----der-rote-planet-hat-doch-kanale-1652057.html
Overview:
Editions/Publications:
- 1958 . Utopia-Science-Fiction-Magazin, #19 (1958, KHF, Pabel, DM 1.00, 96 pages, digest, MAGAZINE)