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(near Alamosa, Colo., Nov. 13, 2007) The Sangre de Cristo mountain range rises beyond the dunes. Brian Metzler and John O'Connor go sandboarding in Great Sand Dunes National Park and Preserve, Colo., on Tuesday, Nov. 13, 2007. STEVE PETERSON

(near Alamosa, Colo., Nov. 13, 2007) The Sangre de Cristo mountain range rises beyond the dunes.  Brian Metzler and John O'Connor go sandboarding in Great Sand Dunes National Park and Preserve, Colo., on Tuesday, Nov. 13, 2007. STEVE PETERSON