Ace Books, NY, 1949 (copyright). Ace Science Fiction Classics, #A-8. [1966] 1st Edition, 1st Printing. Front cover by Jack Gaughan. Blue pictorial wraps, yellow page edges, yellow/white letters. Illustrated w/ B&W front cover + 2-page Map Of Commonwealth. End-papers have darkened with age, and pages of book are also browning. Wraps have a little edge-wear in places, but are still bright & colorful. The white back cover is somewhat shelf-worn. Spine has some creasing from handling, but Title is still fully legible. Publisher's original price of 75 cents at top of spine/front cover. Just a hint of spine slant; still tightly bound. 347 pages + 5 pgs of ads.
