At the Earth's Core cover art

From Author Wars - https://authorwars.com/books/at-the-earths-core-cover-art-1713693.html

Overview:

Title: At the Earth's Core cover art
Author: Frank Frazetta
Year: 1968
Type: Interior Art

Variant Titles:

Editions/Publications:

Unknown. Burroughs Artist Frank Frazetta Portfolio (Unknown, Frank Frazetta, Jewel of Opar Press, [22] pages, other, Non-fiction)
Unknown. Burroughs Artist Frank Frazetta Portfolio (Unknown, Frank Frazetta, Opar Press, xvi pages, other, Non-fiction)