SHAPLEY H., Wir Kinder der Milchstrasse, Econ, 1965. BRAUN, WERNHER VON, The Next 20 Years of Interplanetary Exploration, Marshall Space Flight Center, Greenbelt, Maryland Propulsion Laboratory, California Institute of Technology), Edward Purcell (professor of physics at Harvard University), R. N. Bracewells (Radio Astronomy Institute of Technology), Edward Purcell (professor of physics at Harvard University), R. N. Bracewells (Radio Astronomy Institute of Technology), Edward Purcell (professor of physics
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