Space flight — Juvenile fiction — Audiobooks
Rip Foster in Ride the Gray Planet
by Harold L. (Harold Leland) Goodwin
Young Visitor to Mars
by Richard M. (Richard Mace) Elam
The Planet Mappers
by E. Everett (Edward Everett) Evans
Rip Foster Rides the Gray Planet
by Harold L. (Harold Leland) Goodwin