Close to Critical

From Author Wars - https://authorwars.com/publications/close-to-critical-253910.html

Overview:

Title: Close to Critical
Author: Hal Clement
Year: 1970
ISBN-10: 0345019490
Publisher: Ballantine Books
Price: $0.75
Pages: 190
Binding: Paperback
Type: Novel
Title Reference: Close to Critical
Notes: Stated second printing.