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. 2017 Feb 9;14:E14. doi: 10.5888/pcd14.160043

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The screen shot shows a clue for Cedar Falls Park: “Follow the interpretive signs and discover who operated the power plant at Cedar Falls Park in the early 1900’s. Who was it?” — Screenshot showing an example of a Park Hop park clue, Park Hop mobile app, Greenville County, South Carolina, 2014.