Galactic Derelict, Andre Norton, Ace, 1978.
Born Alice Mary Norton in Cleveland, Ohio, she chose Andre Norton as a pen-name at a time when genre fiction was expected to be written by male authors, and changed her name legally in 1934. Andre, she felt, was ambiguous enough to allow her to write for teenage boys, and many were surprised to find that "Mr Norton" turned out to be a slender, brown-haired and green-eyed young woman.
Norton's novels feature adolescent, independent, often alienated heroes and heroines struggling with their own individuality as they discover more about themselves and the world they live in. These rites of passage are played out against fast-moving quests, with enough action to enthral a teenage audience. (the guardian)
Galactic Derelict is the the second in her Time Traders series. First published in 1959, Galactic Derelict continues the series' premise, an encounter between Western heroes and a mysterious alien race that has used time travel to alter Earth. This novel shifts between present day and the time of Folsom Man, some 10,000 years ago. (wikipedia)
-vintage paperback
-some edgewear
-some corner and spine creasing
-no markings inside
-good condition