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USC_062418_S_B04_11564895
USC_062418_S_B04_11564896
USC_062418_S_B04_11564897
USC_062418_S_B04_11564898
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A gloomy day at the Great Sand Dunes National Park in Colorado. The grey sky contrasts with the vast open space and towering sand dunes. A majestic mountain landscape adds to the natural beauty of the desert surface.