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Liquid-propellant rocket - Wikipedia
Robert H. Goddard - Wikipedia
Robert Goddard and the First Liquid-Propellant Rocket
95 Years Ago: Goddard’s First Liquid-Fueled Rocket - NASA
Dr. Robert H. Goddard, American Rocketry Pioneer - NASA
Robert Goddard Was the Father of American Rocketry. But Did He …
Robert Goddard: American Father of Rocketry | Space
NASA Celebrating 90 Years: Robert Goddard’s Rocket and the …
90 Years Ago, the Liquid-Fueled Rocket Changed Space Travel Forever
Robert Goddard - NASA Earth Observatory