List of national historic sites and historical parks of the United States
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Hetch Hetchy
American frontier
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Sierra Club
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1909 in film
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National Park Service
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Tuolumne County, California
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Palo Alto, California
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Dam
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San Francisco
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Yosemite National Park
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1913
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Environmental movement in the United States
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Dumbarton Bridge (California)
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Hetch Hetchy Valley
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