This NASA Facts website presents a history of Dr. Robert H. Goddard, a pioneer of rocketry. The site describes Goddard's achievements and their relationships to advances in rocketry in Germany. The key site includes a list of his historic "firsts."
Goddard Space Flight Center. Robert H. Goddard: American Rocketry Pioneer. Greenbelt: Goddard Space Flight Center, June 13, 2007. http://www.nasa.gov/centers/goddard/about/history/dr_goddard.html (accessed 19 February 2017).
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