Die stählerne Festung

From Author Wars - https://authorwars.com/books/die-stahlerne-festung-1872862.html

Overview:

Title: Die stählerne Festung
Author: Fletcher Pratt L. Sprague de Camp
Year: 1981
Type: Novels

Editions/Publications:

Unknown. Mathemagie (Unknown, Fletcher Pratt, Heyne, ISBN-10: 3453027906, DM 14.80, 716 pages, Paperback, Omnibus)
Unknown. Mathemagie (Unknown, L. Sprague de Camp, Heyne, ISBN-10: 3453027906, DM 14.80, 716 pages, Paperback, Omnibus)