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searching for Virgil L. Sharpton 1 found (5 total)
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Margaritifer Sinus quadrangle
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A Guide to Martian Impact Craters. Compiled by Nadine G. Barlow, Virgil L. Sharpton http://www.nasa.gov/home/hqnews/2011/dec/HQ_11-403_Mars_Rover_Gypsum