Pendulum

From Author Wars - https://authorwars.com/publications/pendulum-186461.html

Overview:

Title: Pendulum
Author: John Christopher
Year: 1968
ISBN-10:
Publisher: Simon & Schuster
Price: $4.95
Pages: 254
Binding: Hardcover
Type: Novel
Title Reference: Pendulum
Notes:
"First Printing" stated.