National parks for the 21st century :
the Vail agenda : report and recommendations to the Director of the National Park Service from the steering committee of the 75th anniversary symposium.
[Washington D.C.] : National Park Service, 
United States. /
National Park Service
United States. / National Park Service /
National parks and reserves > National parks and reserves / United States > National parks and reserves / United States / Congresses.
135 p. ;
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