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Date Title Primary Contact Primary Institution 1994 Toxic chemical Release Inventory data for Pennsylvania Penn State Data Commons U S Environmental Protection Agency 2017 Toxic chemical Release Inventory data for Pennsylvania, 2017 Penn State Data Commons U S Environmental Protection Agency 2018 Toxic chemical Release Inventory data for Pennsylvania, 2018 Penn State Data Commons U S Environmental Protection Agency 2019 Toxic chemical Release Inventory data for Pennsylvania, 2019 Penn State Data Commons U S Environmental Protection Agency 2003 Ecoregions United States (Omernik) Penn State Data Commons U S Environmental Protection Agency 2010 Ecoregions of Pennsylvania Level III Penn State Data Commons U S Environmental Protection Agency 2010 Ecoregions of Pennsylvania Level IV Penn State Data Commons U S Environmental Protection Agency 2008 EPA Renewable Energy Sites Penn State Data Commons U S Environmental Protection Agency 2012 Ethanol Production by Plant Energy Source Penn State Data Commons U S Environmental Protection Agency