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If you've enjoyed this book, you will not want to miss these

Ace Science-Fiction Novels
D-233 First on Mars by Rex Gordon
The "Robinson Crusoe" of the Red Planet. An unusual and realistic novel of alien life on an alien world.
D-227 Gunner Cade by Cyril Judd
Rebellion of a human automaton!
and CRISIS IN 2140 by Piper & McGuire
Black market in forbidden knowledge.
D-223 The 13th Immortal by Robert Silverberg
Was he a fugitive from Utopia?
and This Fortress World by James E. Gunn
He brought the skies down upon him.
D-255 City Under the Sea by Kenneth Bulmer
Despots of the ocean bottom.
and Star Ways by Poul Anderson
"Enjoyable, fast-moving, convincing."

Astounding S.F.

D-261 The Variable Man and Other Stories by Philip K. Dick
Five exciting adventures in the future.

35¢

If not available at your newsdealer, any of these books may be bought by sending 35¢ (plus 5¢ handling fee) for each number to Ace Books, Inc. (Sales Dept.), 23 W. 47th St., New York 36, N. Y.

Order by book number