the national parks 2
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Geology Of National Parks by Ann G. Harris
Highlights the local history as well as the geologic features and developments of national parks formed by stream erosion and weathering, glaciers and wave action, igneous activity, mountain building and uplift, and ground water.
Laws Relating To The National Park Service by United States
Report Of The Director Of The National Park Service To The Secretary Of The Interior For The Fiscal Year Ended by United States. National Park Service
The National Parks by Ken Burns
By the end of the 19th century, widespread industrialization has left many Americans worried about whether the country - once a vast wilderness - will have any pristine land left. At the same time, poachers in the parks are rampant, and visitors think nothing of littering or carving their names near iconic sites like Old Faithful. Congress has yet to establish clear judicial authority or appropriations for the protection of the parks. This sparks a conservation movement by organizations such as the Sierra Club, led by John Muir; the Audubon Society, led by George Bird Grinnell; and the Boone and Crockett Club, led by Theodore Roosevelt. The movement fails, however, to stop San Francisco from building the Hetch Hetchy dam at Yosemite, flooding Muir's "mountain temple" and leaving him broken-hearted before he dies.