The Challenge of Aab

From Author Wars - https://authorwars.com/publications/the-challenge-of-aab-778272.html

Overview:

Title: The Challenge of Aab
Author: J. E. Sperry
Year: 1972
Publisher: Dell Yearling
Price: $0.95
Binding: Trade Paperback
Type: Novel
Title Reference: The Challenge of Aab
Notes: Amazon sale page, which does not contain reliable pub month (jan 1 is likely filler date), and which lists it as mass market paperback, when it is in fact a Dell Yearling title, which were all trade size paperbacks at that time, for young readers (YR)