Back to the Stone Age

From Author Wars - https://authorwars.com/publications/back-to-the-stone-age-285340.html

Overview:

Title: Back to the Stone Age
Author: Edgar Rice Burroughs
Year: 1939
Publisher: Grosset & Dunlap
Price: $0.75
Pages: 318
Binding: Hardcover
Type: Novel
Title Reference: Back to the Stone Age
Notes: Per Henry Hardy Heins' A Golden Anniversary Bibliography of Edgar Rice Burroughs and Robert B. Zeuschner's Edgar Rice Burroughs, this is not a true separate printing. Rather, remaindered copies of the first edition were sold with a new dust jacket.