Das Rätsel der UFOs
From Author Wars - https://authorwars.com/books/das-ratsel-der-ufos-2377589.html
Editions/Publications:
- 1969 . Das Rätsel der UFOs (1969, Stephan, Moewig, DM 2.40, 144 pages, Paperback, Non-fiction)
From Author Wars - https://authorwars.com/books/das-ratsel-der-ufos-2377589.html