The Space Ark

From Author Wars - https://authorwars.com/publications/the-space-ark-103431.html

Overview:

Title: The Space Ark
Author: A. M. Lightner
Year: 1968
Publisher: G. P. Putnam's Sons
Price: $3.50
Pages: 190
Binding: Hardcover
Type: Novel
Title Reference: The Space Ark
Notes:
The internal illustrations consist of 6 full page drawings. "Illustrated by Dennis McMains". The cover artist is not credited, but is stylistically identical to the internal illustrations, and hence is almost certainly also McMains, who is credited as the artist for another book in this series.