Beginning in 1872 with the establishment of Yellowstone, national parks were set aside to preserve for future generations the most spectacular and inspirational features of the country. The best representative examples were sought out of major ecosystems, such as Yosemite, geologic forms, such as the Grand Canyon, archaeological sites, such as Mesa Verde, and scenes of human events, such as Gettysburg. But one type of habitat--the desert--was overlooked...
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Nature