Willy Ley

• The Conquest of Space
• Engineer's Dreams
• Engineers' Dreams
• Engineers' Dreams Great Projects That COULD Come True (Explorer Books)
• Gas Giants The Largest Planets
• Planets
• Poles
• Satellites, rockets, and outer space (Signet science library)
• The borders of mathematics (The Worlds of science, WS/22. Mathematics)
• Watchers of the Skies
• Willy Ley's Exotic Zoology