Caves of the Druufs
From Author Wars - https://authorwars.com/books/caves-of-the-druufs-907675.html
Editions/Publications:
- Unknown. Perry Rhodan #72: Caves of the Druufs (Unknown, Kurt Mahr, Ace Books, $1.25, 164 pages, Paperback, MAGAZINE)
From Author Wars - https://authorwars.com/books/caves-of-the-druufs-907675.html