The first edition of Landforms has the letters ABCDEF on page 160. © Copyright 1971 by Western Publishing Company, Inc. Published by Golden Press, New York, N.Y. Cover price is $1.25. The number on the spine is 24350. Listed as a Golden Science Guide.
The only cover change to Landforms is shown next. The text on the back cover changed as well. But the illustrations stayed the same. Still dated 1971 with a $1.95 cover price. The ISBN number on the back cover is 0-307-24350-8. My copy has the letters EF on page 160.
The very next printing of Landforms had a background color change. It changed from a reddish brown to brown. And the text on the back cover changed slightly. Still dated 1971 with a $1.95 cover price. The ISBN number on the back cover is 0-307-24350-8. The letter F is on page 160. (not shown)
A French version of Landforms is titled formes et reliefs. © 1972 by Western Publishing Company, Inc. Publié par les Editions des Deux Coqs d'Or, Paris, 1975. From the last page: Imprimé en Italie- Interlithio Milan. Number 154 in the Le Petit Guide series. (image #3)
Shown last is the Spanish version of Landforms titled Corteza terrestre. © Copyright 1971 by Western Publishing Company, Inc., y por licencia para la lengua española, 1976, por Editiones Daimon, Manuel Tamayo, Barcelona Spain.
Image #1 also exists in a large (5 ¼ by 7 ¾ inch) hardcover. The number on the back cover is 63550.
No revised edition exists that I am aware of. Out of print.