Cadwalader Ringgold:
A Planet For Texans - Ace Double D-299 - H. Beam Piper and John J. McGuire - cover artist Arthur Renshaw
Cadwalader Ringgold:
Cosmic Computer (Junkyard Planet) - H. Beam Piper
Cadwalader Ringgold:
Lord Kalvan of Otherwhen - H. Beam Piper
Cadwalader Ringgold:
Other Human race - H Beam Piper
Cadwalader Ringgold:
Space Viking - H. Beam Piper
Cadwalader Ringgold:
Little Fuzzy - H. Beam Piper - cover by Victor Kalin - 1st edition
Cadwalader Ringgold:
Fuzzy Sapiens (previouslt titled The Other Human Race) - H. Beam Piper - cover artist Michael Whelen
Cadwalader Ringgold:
Four-Day Planet and Lone Star Planet by H. Beam Piper - cover artist Michael Whelan
Cadwalader Ringgold:
Federation - H. Beam Piper - cover artist
Cadwalader Ringgold:
Uller Uprising - H. Beam Piper - cover artist Gino D' Achille