At the Earth's Core

From Author Wars - https://authorwars.com/publications/at-the-earths-core-854319.html

Overview:

Title: At the Earth's Core
Author: Edgar Rice Burroughs
Year: Unknown
Publisher: Ace Books
Price: $1.25
Pages: 159
Binding: Paperback
Type: Novel
Title Reference: At the Earth's Core
Notes: No printing date given. Ad at end if 15J, for ERB books priced at $1.50. Source: Edgar Rice Burroughs: The Descriptive Bibliography of Ace and Ballantine / Del Rey Paperback Books - title, publisher, pages, catalog ID, price, printing history, ads.