Der Große Ring Neptuns

From Author Wars - https://authorwars.com/books/der-grosse-ring-neptuns-2863110.html

Overview:

Title: Der Große Ring Neptuns
Author: Martin Gardner
Year: 1982
Type: Short Fiction

Editions/Publications:

Unknown. Denkspiele aus der Zukunft (Unknown, Martin Gardner, Bertelsmann / Book Sales Clubs, xiv+144 pages, Trade Paperback, Collection)