None But Man by Gordon R. Dickson

Publisher: DAW (1981)
ISBN-10: 0879976217
ISBN-13: 9780879976217
Paperback
Item Weight: 2.4 ounces
Dimensions: 7 x 1 x 5 inches, 240 pages

Cully When, frontiersman of a future century, tries to save the last human settlement in the Pleiades from alien invasion in this story of space-age guerrilla warfare