07/09/2009 05:12 am ET Updated May 25, 2011

National Park Free Entry Weekends: Yosemite, Grand Canyon And Yellowstone

The Interior Department on Tuesday said Yosemite, Grand Canyon, Yellowstone and 144 other national parks would offer free admission on three weekends this summer: June 20-21, July 18-19 and Aug. 15-16.

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