Cadwalader Ringgold:
Edgar Rice Burroughs - The Gods of Mars - The Martian Tales book 2 - cover artist Michael Whelan
Cadwalader Ringgold:
Pellucidar - Edgar Rice Burroughs - cover artist David B. Mattingly
Cadwalader Ringgold:
Edgar Rice Burroughs - Out of Time's Abyss - cover artist Roy G. Krenkel, Jr.
Cadwalader Ringgold:
Edgar Rice Burroughs - The Eternal Savage - cover artist Roy G. Krenkel, Jr.
Cadwalader Ringgold:
Chessmen of Mars - Edgar Rice Burroughs
Cadwalader Ringgold:
Gods of Mars - Edgar Rice Burroughs
Cadwalader Ringgold:
Edgar Rice Burroughs - John Carter of Mars book 11 - cover artist Michael Whelan
Cadwalader Ringgold:
More Martian Tales: Thuvia: Maid of Mars & The Chessmen of Mars - Edgar Rice Burroughs
Cadwalader Ringgold:
The Warlords of Mars - Edgar Rice Burroughs - cover artist Michael Whelan