Tunnel in the Sky

From Author Wars - https://authorwars.com/publications/tunnel-in-the-sky-87452.html

Overview:

Title: Tunnel in the Sky
Author: Robert A. Heinlein
Year: 1978
ISBN-10: 0345281950
Publisher: Del Rey / Ballantine
Price: $1.75
Pages: 214
Binding: Paperback
Type: Novel
Title Reference: Tunnel in the Sky
Notes:
"First Ballantine Books Edition: March 1977" " Fourth Printing: November 1978"; no number line "Cover art by Darrell Sweet" on copyright page, the artwork is also signed Printed in the US