Double Star

From Author Wars - https://authorwars.com/publications/double-star-420806.html

Overview:

Title: Double Star
Author: Robert A. Heinlein
Year: 1964
Publisher: Signet / New American Library of Canada
Price: C$0.50
Pages: 128
Binding: Paperback
Type: Novel
Title Reference: Double Star
Notes:
• "First Printing, November, 1957" • "Second Printing, January, 1964"; no number line • Printing history refers to Canadian printings • The artist is not credited; no visible signature. • Cover is a portion of the first Signet printing's cover which is verified as being by Powers • Cover printed in the US, book in Canada