The Challenge of the Spaceship

From Author Wars - https://authorwars.com/publications/the-challenge-of-the-spaceship-292600.html

Overview:

Title: The Challenge of the Spaceship
Author: Arthur C. Clarke
Year: 1980
ISBN-10: 0671821393
Publisher: Pocket Books
Price: $2.50
Pages: 222
Binding: Paperback
Type: Non-fiction
Title Reference: Report on Planet Three
Notes: The copyright page states: First Pocket Books printing June, 1980 full number line: 10 9 8 7 6 5 4 3 2 1. ''Completely revised and updated by the author'' stated on the front cover, but it remains elusive when and to what degree was the book revised and updated. No internal evidence about any updates after the late 1950s. The copyright page also states that all material was previously published in no fewer than seven magazines (listed). The essays are not copyrighted separately, but the latest year mentioned is 1959.