Books about Life on other planets -- Fiction (sorted alphabetically)
- Planet That Time Forgot Donald A. Wollheim
- price of eggs Randall Garrett
- Pride of Islands C. C. MacApp
- Problem Planet R. R. Winterbotham
- Prodigal Weapon Bill Garson
- Radio Planet Ralph Milne Farley
- Rebel of Valkyr Alfred Coppel
- Rebels of the Red Planet Charles L. Fontenay
- Recluse Mike Curry
- Retief of the Red-Tape Mountain Keith Laumer
- Revolt of the Outworlds Stephen Marlowe
- right side of the tracks Albert Teichner
- Rockabye, Grady David Mason
- Rondah; or, thirty-three years in a star Florence Carpenter Dieudonné
- Second stage Lensmen E. E. Smith
- Shipshape Miracle Clifford D. Simak
- Slave Planet Laurence M. Janifer
- Space Blackout Sam Carson
- Spacerogue Robert Silverberg
- Star chamber H. B. Fyfe
- Star of Rebirth Bernard Wall
- Star Ship Poul Anderson
- Steel Giants of Chaos James R. Adams
- Stranger From Space Hannes Bok
- Strangers to Straba Carl Jacobi