The Gods of Mars and The Warlord of Mars

From Author Wars - https://authorwars.com/books/the-gods-of-mars-and-the-warlord-of-mars-549149.html

Overview:

Title: The Gods of Mars and The Warlord of Mars
Author: Frank Frazetta
Year: 1971
Type: Cover Art

Variant Titles:

Editions/Publications:

Unknown. The Gods of Mars and The Warlord of Mars (Unknown, Frank Frazetta, Nelson Doubleday / SFBC, $2.49, xii+336 pages, Hardcover, Omnibus)