Definition of National Park Service from the Oxford Advanced Learner's Dictionary

 

National Park Service

 
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the US government organization in charge of the National Park System. This includes national parks and other types of protected area, including national historical parks, national military parks, national monuments, national memorials, national preserves and national recreation areas. The National Park Service was established in 1916 by President Woodrow Wilson and is part of the US Department of the Interior.