The Sun Smasher, Ace Double paperback cover, 1959
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37835589724_00868066cc_o
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The Ultimate Weapon Of An Uncrowned King
I always liked the ACE Doubles. The cover art and imaginative retitling of the stories were great examples of the pulp style.
BTW – the second “complete and unabridged” novel in this book was
D-351b Starhaven, Planet of the outcasts by Ivar Jorgenson (aka Robert Silverberg). (cover by Ed Valigursky; 1959)
Just FYI