Liana (left) and Parmenter Welty shield themselves from windblown sand, Great Sand Dunes National Park, Colorado.

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Keywords: adult, america, caucasian, color, colorado, danger, day, dune, dunes, great, hide, hiker, horizontal, image, man, national, north, outdoors, park, people, pole, recreation, sand, states, trekking, united, usa, wind, woman