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 An aerial view of peaks in the Rocky Mountains near Denver, Colorado. An aerial view of the Rocky Mountains. An aerial view of the Rocky Mountains in winter. An aerial view of some of Colorado's highest peaks, including Mount Shavano (nearest), Tabeguache Peak, Mount Antero, and Mount Princeton (in the distance). An aerial view of some of Colorado's highest peaks, including Mount Shavano (nearest), Tabeguache Peak, Mount Antero, and Mount Princeton (in the distance). An aerial view of Sierra Nevada high country in winter. An aerial view of Ellery Lake along Tioga Pass Road (120) in winter. An aerial view of Sierra Nevada high country in winter. An aerial view of the crest of the Sierra Nevada in winter. The crest of the Sierra Nevada in winter, looking north to Lake Tahoe. An aerial view of Mt. Evans, Colorado. An aerial view of the Rocky Mountains, with Mt. Evans near the top. An aerial view of Mt. Evans, Colorado. An aerial view of the crest of the Sierra Nevada Mountains, with Mono Lake in the upper left. Big Baldy (8,209 ft.) in winter, Kings Canyon National Park. A pine cone and needle in the snow. A weatherbeaten tree with a fresh dusting of snow on a ridge at about 8,000 ft. in Kings Canyon National Park, on the trail to Big Baldy. Lunchtime on a cross-country ski outing at Big Meadows, Giant Sequoia National Monument. Wuksachi Lodge in winter, Sequoia National Park, California. Wuksachi Lodge in winter, Sequoia National Park, California. An aerial view of a snowy landscape (February 2007) near Rochester, NY. An aerial view of snow-covered farmland and Lake Michigan near Chicago. An aerial view of a winter (February 2007) landscape between Chicago and upstate New York. A warming hut at the Royal Gorge Cross Country Ski Resort in the Sierra Nevada Mountains. A warming hut at the Royal Gorge Cross Country Ski Resort in the Sierra Nevada Mountains. A small lake at the Royal Gorge Cross Country Ski Resort in the Sierra Nevada Mountains. A small lake at the Royal Gorge Cross Country Ski Resort in the Sierra Nevada Mountains. The Royal Gorge Cross Country Ski Resort in the Sierra Nevada Mountains. The Royal Gorge Cross Country Ski Resort in the Sierra Nevada Mountains. The South Rim of the Grand Canyon during a respite in a winter storm.

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