5 public-domain matches

Barsoom

Cover of A Princess of Mars

A Princess of Mars

Edgar Rice Burroughs

Cover of The Chessmen of Mars

The Chessmen of Mars

Edgar Rice Burroughs

Cover of The Blonde from Barsoom

The Blonde from Barsoom

Robert F. Young

Cover of Warriors of Mars: The Warfare of Barsoom in Miniature (1974)

Warriors of Mars: The Warfare of Barsoom in Miniature (1974)

Gary Gygax and Brian Blume

Cover of Barsoom!

Barsoom!

Richard A. Lupoff