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1Published 1989“...[National Park Service],...”
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5Published 2016“...National Park Service,...”
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11by Sadin, Paul“...[National Park Service?],...”
Published 2007
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13Published 2004“...National Park Service, Yosemite National Park,...”
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14Published 2012“...National Park Service, Yosemite National Park,...”
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15Published 2015“...National Park Service, Joshua Tree National Park,...”
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17by Roberts, Lois W., 1932-“...[National Park Service, Denver Service Center],...”
Published 1979
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18Published 2011“...Yosemite National Park, National Park Service, U.S. Department of the Interior,...”
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19Published 2014“...Yosemite National Park, National Park Service, U.S. Department of the Interior,...”
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20Published 1984“...National Park Service, Dept. of the Interior,...”
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