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![Park Ranger and Visitor at Acadia National Park Park Ranger and Visitor at Acadia National Park](https://webarchive.library.unt.edu/web/20130214183906im_/http://www.nature.nps.gov/assets/images/RangerThayer.jpg)
Park ranger Robert Thayer explains the use of a polarizing lens in Acadia National Park.
Last Updated: September 13, 2012
Last Updated: September 13, 2012