Aus Worlds Within Worlds (1972)

From Author Wars - https://authorwars.com/books/aus-worlds-within-worlds-1972-1822701.html

Overview:

Title: Aus Worlds Within Worlds (1972)
Author: Isaac Asimov
Year: 1984
Type: Essays

Editions/Publications:

Unknown. Opus 200 Band 1 (Unknown, Isaac Asimov, Moewig, ISBN-10: 3811836587, DM 7.80, 189 pages, Paperback, Collection)
Unknown. Opus 200 (Unknown, Isaac Asimov, Moewig, ISBN-10: 3811838709, DM 8.80, 189+190 pages, Paperback, Collection)