About the book: year / The entire cycle "The Wizard of the Emerald City", off-cycle stories and popular science works. Contents:1. The Wizard of the Emerald City (collection without illustrations) (1939-1976)2. The Wake of the Stern (1960)3. Travelers in the Third Millennium (1960)4. The Adventures of Two Friends in the Land of the Past (1963)5. Earth and sky (1957)