Piper - Four-Day Planet - New paperback or softback - 65 - X555z

Piper - Four-Day Planet - New paperback or softback - 88 - X555z

Piper - Cosmic Computer - New paperback or softback - 46 - X555z

Piper - Four-Day Planet - paperback or softback - 71 - X555z

Beam Piper - Last Enemy - New paperback or softback - X555z

Beam Piper - Graveyard of Dreams - New paperback or softback - X555z

Beam Piper - Answer - New paperback or softback - 33 - X555z

Beam Piper - Genesis - New paperback or softback - 35 - X555z