Islands In The Sky.
Arthur C. Clarke
Hardcover
(Holt, Rinehart & Winston, Inc. 1967., Jan. 1, 1967)
"Islands in the Sky is a 1952 science fiction novel by British writer Arthur C. Clarke. It is one of his earliest works and is one of the thirty-five juvenile novels published in the 1950s for a readership of teenagers. Clarke wrote the story as a travelogue of human settlement of cislunar space in the last half of the twenty-first century."