1. Exemption of oil and gas exploration and production wastes from federal hazardous waste regulations;USEPA,2002
2. Hydraulically fractured wells provide two-thirds of U.S. natural gas production;USEIA,2016
3. Marcellus play report: geology review and map updates;USEIA,2017
4. Marcellus shale play geology review;USEIA,2017
5. Method 1311: Toxicity Characteristic Leaching Procedure;USEPA,2007