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Date: 2015-01-08 09:04:37Spaceflight Exploration of Mars Astronomy Outer space Manned missions to Mars Mars Martian canal Percival Lowell Martian The Martian Chronicles Space Exploration Initiative Outline of Mars | Mars Wars The Rise and Fall of the Space Exploration Initiative Thor Hogan The NASA History SeriesAdd to Reading ListSource URL: history.nasa.govDownload Document from Source WebsiteFile Size: 1,13 MBShare Document on Facebook |