The Land of Hidden Men

From Author Wars - https://authorwars.com/publications/the-land-of-hidden-men-42658.html

Overview:

Title: The Land of Hidden Men
Author: Edgar Rice Burroughs
Year: 1978
ISBN-10: 0441470165
Publisher: Ace Books
Price: $1.95
Pages: 217
Binding: Paperback
Type: Novel
Title Reference: The Land of Hidden Men
Notes:
"This Ace printing: August 1978"; no number line "Cover painting by Frank Frazetta" on copyright page