Contraband Rocket / The Forgotten Planet

From Author Wars - https://authorwars.com/books/contraband-rocket--the-forgotten-planet-792329.html

Overview:

Title: Contraband Rocket / The Forgotten Planet
Author: G. Harry Stine Murray Leinster
Year: 1956
Type: Omnibuses

Variant Titles:

1956. Contraband Rocket / The Forgotten Planet