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2013, agriculture, americas heartland, beauty, bridget calip, cloud, coal, colorado, contours, day, fossil fuel, front range, gasoline, geology, industry, lever, man made object, methane, natural gas, nature, north america, oil, oil industry, oil pump, oil rig, outdoors, overcast, prairie, refueling, rocky mountains, rolling landscape, rural scene, scenics, sky, steel, summer, vertical, weld county,