Der siebte Schlüssel

From Author Wars - https://authorwars.com/books/der-siebte-schlussel-2434992.html

Overview:

Title: Der siebte Schlüssel
Author: Kurt Mahr
Year: 1979
Type: Essays
Series: Perry Rhodan Computer
Number in Series: 249

Variant Titles:

1979. Der siebte Schlüssel