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NASA factsan educational publication of the National Aeronautics and Space Administrationfederal doc
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Taking technology higherthe Naval Center for Space Technology and the making of the space agefederal docby Amato, Ivan
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United States Space Force fact sheetfederal docPublished 2019
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The astronomical almanacfor the year ; data for astronomy space sciences geodesy surveying navigation and other applicationsfederal docPublished 2016