Expedition to Earth

From Author Wars - https://authorwars.com/publications/expedition-to-earth-420164.html

Overview:

Title: Expedition to Earth
Author: Arthur C. Clarke
Year: 1965
Publisher: Ballantine Books
Price: C$0.50
Pages: 165
Binding: Paperback
Type: Collection
Title Reference: The Sentinel
Notes:
• "First Printing: December 1953" • "Second Printing: February 1961" • "Third Printing, July 1965", no number line. • The artist is not credited, no visible signature. Artwork is a cropped version of the first printing's cover, which is signed. • Cover printed in the US, book in Canada