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EcotourismOct. 20, 2006
Managing Western LandsApr. 22, 2016
National ParksJan. 17, 2014
National ParksMay 28, 1993
National ParksMay 22, 1987
National Parks CentennialFeb. 16, 1972
National Parks Under PressureOct. 6, 2006
Native American SovereigntyMay 5, 2017
Outdoor RecreationMay 9, 1962
Protecting the National ParksJun. 16, 2000
Protecting the OceansOct. 17, 2014
Recreation for MillionsJul. 13, 1949
Species ExtinctionDec. 15, 2017
Wilderness PreservationMay 30, 1975
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