Roland Seitre / Dromedary camel (Camelus dromedarius) calf Oriental Great Erg sand dunes, Jbil National Park, Tunisia.
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Shattil & Rozinski / San Luis valley, Great Sand Dunes National Park, Colorado, USA
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Tim Fitzharris / 750 foot tall sand dunes, tallest in North America, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Rubber Rabbitbrush (Chrysothamnus nauseosus) blooming near Cottonwood (Populus sp) trees in sand dunes in winter, Mount Herard, Great Sand Dunes National Park, Colorado
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Tim Fitzharris / Rubber Rabbitbrush (Chrysothamnus nauseosus) blooming near Cottonwood (Populus sp) trees in sand dunes in winter, Mount Herard, Great Sand Dunes National Park, Colorado
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Tim Fitzharris / Ponderosa Pine (Pinus ponderosa) trees and Mount Herard, Great Sand Dunes National Park, Colorado
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Tim Fitzharris / Ponderosa Pine (Pinus ponderosa) trees and Mount Herard, Great Sand Dunes National Park, Colorado
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Tim Fitzharris / Mount Herard, Great Sand Dunes National Park, Sangre de Cristo Range, Colorado
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Tim Fitzharris / Mount Herard framed by hole in tree, Great Sand Dunes National Park, Colorado
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Tim Fitzharris / Mount Herard framed by tree hole, Great Sand Dunes National Park, Colorado
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Tim Fitzharris / Cottonwood (Populus sp) trees in winter, Mount Herard, Great Sand Dunes National Park, Colorado
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Tim Fitzharris / Cottonwood (Populus sp) trees in winter, Mount Herard, Great Sand Dunes National Park, Colorado
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Roland Seitre / Dromedary camels (Camelus dromedarius) Oriental Great Erg sand dunes, Jbil National Park, Tunisia.
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Roland Seitre / Dromedary camel (Camelus dromedarius) mother and baby, Oriental Great Erg sand dunes, Jbil National Park, Tunisia.
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Roland Seitre / Dromedary camel (Camelus dromedarius) calf Oriental Great Erg sand dunes, Jbil National Park, Tunisia.
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Roland Seitre / Dromedary camel (Camelus dromedarius) calf Oriental Great Erg sand dunes, Jbil National Park, Tunisia.
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Roland Seitre / Dromedary camel (Camelus dromedarius) mother and calf, Oriental Great Erg sand dunes, Jbil National Park, Tunisia.
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Roland Seitre / Dromedary camel (Camelus dromedarius) mother and calf, Oriental Great Erg sand dunes, Jbil National Park, Tunisia.
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Tim Fitzharris / Sand Creek, Great Sand Dunes National Park, Colorado
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Tim Fitzharris / Sand dunes and shrubland, Great Sand Dunes National Park, Colorado
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Tim Fitzharris / Sand dunes and river, Great Sand Dunes National Park, Colorado
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Tim Fitzharris / Sand dunes, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Sagewort (Artemisia sp) on sand dune, Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Desert vegetation in Great Sand Dunes National Park, Colorado
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Kirkendall-Spring / Fresh snow on sand dunes in Great Sand Dunes National Park, Colorado, USA
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Tim Fitzharris / Coyote tracks flowering shrubs on the dune fields in front of the Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Grasslands and dunes, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Storm clouds over Great Sand Dunes National Monument, Colorado
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Shattil & Rozinski / San Luis valley, Great Sand Dunes National Park, Colorado, USA
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Tim Fitzharris / Sangre de Cristo Mountains visible behind 750-foot tall sand dunes in winter, Great Sand Dunes National Park, Colorado
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Tim Fitzharris / Sand dunes with Sangre de Cristo Mountains in the background, Great Sand Dunes National Park and Preserve, Colorado
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Tim Fitzharris / Rippled sand dunes with Sangre de Cristo Mountains in the background, Great Sand Dunes National Park and Preserve, Colorado
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Tim Fitzharris / Trees killed by shifting sands, Great Sand Dunes National Park and Preserve, Colorado
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Tim Fitzharris / 750 foot tall sand dunes rise against the Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Rocky Mountain Bee Plant (Cleome serrulata) flower, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Sangre de Cristo Mountains at Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Patterns in stream bed, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Coyote tracks flowering shrubs on the dune fields in front of the Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Flowering shrubs on the dune fields in front of the Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Sangre de Cristo Mountains at Great Sand Dunes National Monument, Colorado
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Michael & Patricia Fogden / Great Sand Dunes National Monument, Colorado
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Michael & Patricia Fogden / Great Sand Dunes National Monument, Colorado
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Shin Yoshino / Sand dunes in the Great Sand Dunes National Monument, Colorado
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Jim Brandenburg / Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Dead tree, sand dunes, and mountains, Great Sand Dunes National Park, Colorado
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Tim Fitzharris / Sand dunes and mountains, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Sagewort (Artemisia sp) on sand dune with snow, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Sand dunes, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Humboldt Peak, Sangre de Cristo Mountains, Great Sand Dunes National Park, Colorado