By Ley, Willy.
New York Viking Press 1959 .
468 p. 22 cm..

By Ley, Willy.
New York Viking Press 1968 .
xvii, 557 p. , First published in 1944 under title: Rockets.

By Ley, Willy.
[New York] New American Library 1962 .
128 p. 18 cm..

By Ley, Willy.
New York D. McKay Co. 1969 .
viii, 180 p. , 921003

By Ley, Willy.
New York Viking Press 1962 .
468 p.

By Ley, Willy.
New York Viking Press 1952 .
x, 361 p. , First pub. in 1941 under title: The lungfish and the unicorn. 22 cm..

By Ley, Willy.
New York Time, inc. 1962 .
192 p. 28 cm..

By Ley, Willy.
México Offset Multicolor 1966 .
p. , Translation of: The poles.

By Ley, Willy.
New York Time-Life Books 1971 .
192 p. , Includes index. 28 cm..