Asimov, Isaac. Illustrated by Herrick, Herb. Mars. Chicago: Follett Publishing Co. (29 p.) 21 cm.
This book was also found in a lot of school rooms and school libraries.
It focuses on what is known about Mars at the time, both how it appears through the telescope and planetary conditions. It includes a short discussion and a photograph from the Mariner mission. Worth seeking out for a wonderful cover and illustrations of Mars vehicles, a Mars base, and a Mars rover. Part of the "Follett Science" series. See 1971 UK reprint.