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Polar Dune City Ruins: Mars Civilization Evidence #99-abc-123
Links: South Polar Residual Cap: http://ida.wr.usgs.gov/html/e10040/e1004099.html
South Polar Residual Cap #2: http://ida.wr.usgs.gov/html/e10040/e1004001.html
South Polar Residual Cap Arizona Image: http://hirise.lpl.arizona.edu/PSP_004778_0945
Thanks to USGS/NASA/MALIN/JPL/ASU for these original Mars images
Image below: PhotoShop filter Bas Relief
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