John Polgreen

Year	Publication	Title
1957	Space Pilots	Space Pilots
1958	Space Stations	Space Stations
1959	Space Flight: The Coming Exploration of the Universe	Space Flight: The Coming Exploration of the Universe

Year	Publication	Title
1957	Space Pilots	Space Pilots
1958	Space Stations	Space Stations
1959	Space Flight: The Coming Exploration of the Universe	Space Flight: The Coming Exploration of the Universe
1960	Satellites in Outer Space	Satellites in Outer Space
1960	Satellites in Outer Space	Satellites in Outer Space
1964	Satellites in Outer Space: Revised Edition	Satellites in Outer Space
1966	Satellites in Outer Space: Revised Edition	Satellites in Outer Space: Revised Edition
1967	Vuelos espaciales : las exploraciones actuales y futuras del universo	Vuelos espaciales: Las exploraciones actuales y futuras del universo
1973	Satellites in Outer Space: Revised Edition	Satellites in Outer Space: Revised Edition

Pen Names 1