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RT @USGS_Pubs: Check out geochemical maps of stream sediments in central Colorado: http://t.co/ZGlylcyhF9 http://t.co/lQpsaLmuN7
RT @USGS_Pubs: Check out geochemical maps of stream sediments in central Colorado: http://t.co/ZGlylcyhF9 http://t.co/lQpsaLmuN7