Starhaven / The Sun Smasher

From Author Wars - https://authorwars.com/books/starhaven--the-sun-smasher-794749.html

Overview:

Title: Starhaven / The Sun Smasher
Author: Robert Silverberg Edmond Hamilton
Year: 1959
Type: Omnibuses

Variant Titles:

1959. Starhaven / The Sun Smasher