Author:David Scot Francis Portree
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Works
[edit]- Humans to Mars: Fifty Years of Mission Planning, 1950-2000
- Mir Hardware Heritage
- NASA's Origins and the Dawn of the Space Age
- Orbital Debris: A Chronology
- Walking to Olympus: An EVA Chronology
Some or all works by this author are in the public domain because they were created by the United States National Aeronautics and Space Administration (NASA), whose copyright policy states that "NASA material is not protected by copyright unless noted".
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