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Death Valley National Park
PARO
California
Nevada
National Park
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Great Basin National Park
PARO
Nevada
National Park
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Lake Mead National Recreation Area
PARO
SWRO
Nevada
Arizona
National Recreation Area
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Old Spanish National Historic Trail
PARO
SWRO
Arizona
California
Colorado
Nevada
New Mexico
Utah
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Pony Express National Historic Trail
PARO
SWRO
MWRO
NRRO
California
Colorado
Kansas
Nebraska
Nevada
Missouri
Utah
Wyoming
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Tule Springs Fossil Beds National Monument
PARO
Nevada
National Monument
