Closed System

From Author Wars - https://authorwars.com/publications/closed-system-191401.html

Overview:

Title: Closed System
Author: Zach Hughes
Year: Unknown
ISBN-10: 0451141709
Publisher: Signet
Price: $2.95
Pages: 222
Binding: Paperback
Type: Novel
Title Reference: Closed System
Notes:
2nd printing (per number line) of 1986 Signet ed.
Spine# ISBN. Cover# 451-AE4170
The cover artist is not credited nor is a signature visible. Cover art credit per same art used & credited in Zones of Thought $3.95 in Canada.