Invaders from earth /
Silverberg, Robert.
Silverberg, Robert.Best of Robert Silverberg.
London Sidgwick and Jackson
1978
Contents: Invaders from earth / by Robert Silverberg. Originally published: New York : Ace Books, 1958 ; and in 'A Robert Silverberg omnibus', London : Sidgwick and Jackson, 1970 - The best of Robert Silverberg. Originally published: New York : Pocket Books, 1976 ; London : Sidgwick and Jackson, 1977
English fiction.