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Environment
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Polygon
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2012
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1. North American Shale Plays, Fall 2012
2012. Hart Energy Publishing. This polygon shapefile contains information pertaining to shale gas plays in North America. This layer includes data for fall quarter 2012.This lay... Hart Energy Publishing.
2. U.S. Parks, 2013
2012. TomTom North America, Inc. U.S. Parks represents parks, gardens, and forests within the United States at national, state, county, regional, and local levels.