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National parks (United States)

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Maintained by the United States National Park Service:

Table of contents

National Parks

National Monuments

National Historical Parks, Memorials, and Battlefields

National Recreation Areas, Seashores and Trails

Other Preserves and Protected Areas



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Quadratic formula

... symbol <math>\pm \sqrt {b^2-4ac}</math> in the formula should be understood as "either of those element(s) of the field whose square equals b2 - 4ac". In ...

 
 
 
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