Edition: First hardcover edition and first printing of the revised edition.
New York: Crown, (1984.) dj. Hardcover first edition - The author's fourth novel (fifth book), a story of first contact with an alien civilization, originally published only in paperback in 1960. Volume 8 in the Crown Classics of Modern Science Fiction Series with a foreword by Asimov, an introduction by George Zebrowski and a new afterword by the author, in which he explains his revisions and why he made them. Small format. 207 pp. ISBN: 0-517-552949.
Condition: Very good in a fine dust jacket. (prev owner's name, corner of a few pages bumped.)