Cadwalader Ringgold:
Children of the Lens - E.E. "Doc" Smith
Cadwalader Ringgold:
Skylark Three - E.E. Smith
Cadwalader Ringgold:
Skylark of Valeron - Edward E. Smith
Cadwalader Ringgold:
Skylark Three - E.E. "Doc" Smith - cover artist Jack Gaughan
Cadwalader Ringgold:
Skylark of Space - E.E. "Doc" Smith - cover artist Jack Gaughan
Cadwalader Ringgold:
Runaway Robot - Lester Del Rey - cover artist Wayne Blickenstaff