For your consideration, 3 paperback books comprising part of The Famous Lensman Series by science fiction author E. E. "Doc" Smith. All 3 books are used and in fair condition. And while they're too ragged to be collector copies they're still perfectly suitable to read for pleasure. A little about each book...
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First Lensman Lensman #2 (Pyramid, 1974)
In the not too distance future, while fleets of commercial space ships travel between the planets of numerous solar systems, a traveler named Virgil Samms visits the planet Arisia. There he becomes the first wearer of the Lens, the almost-living symbol of the forces of law and order. As the first Lensman, Samms helps to form the Galactic Patrol, a battalion of Lensmen who are larger than life heroes. These solders are the best of the best, with incredible skills, stealth, and drive. They are dedicated and incorruptible fighters who are willing to die to protect the universe from the most horrific threat it has ever known.
Second Stage Lensman Lensman #5 (Pyramid, 1977)
Warrior, telepath, interplanetary spy. Kim Kinnison was Number One Man of his time. To him fell the incredible assignment of infiltrating the inner circle of Boskone. Kinnison's deadly job was to become a loyal Boskonian in every gesture, thought and deed. He had to work himself up through the ranks of an enemy alien organization, into the highest echelons of power - until it was he who would be issuing the orders that would destroy his own civilization!
Masters of the Vortex Lensman #7 (Pyramid, 1968)
A churning nuclear fireball, appearing out of nowhere, bringing utter destruction--and countless numbers of them were menacing planets throughout the Galaxy! "Storm" Cloud, nucleonic genius, set out in his spaceship Vortex Blaster to track and destroy the mysterious vortices--and embarked on a saga of adventure, discovery and conflict among the far stars that could have been told only by the incomparable "Doc" Smith.