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National Research Council (U.S.). Committee to Review NASA's Exploration Technology Development Program and Inc ebrary. A Constrained Space Exploration Technology Program: A Review of NASA's Exploration Technology Development Program. Washington, D.C.: National Academies Press, 2008.

National Research Council (U.S.). Committee to Review NASA's Exploration Technology Development Program and Inc ebrary. A Constrained Space Exploration Technology Program: A Review of NASA's Exploration Technology Development Program. National Academies Press, 2008.