1. U.S. District Court for the District of Wyoming. Order on Motions for Preliminary Injunction, Case No. 2:15-CV-043-SWS. Petitioners: States of Wyoming, State of Colorado and Intervenor-Petitioners: State of North Dakota, State of Utah, and Ute Indian Tribe vs. U.S. Department of the Interior. Respondents, Sierra Club, Earthworks, Western Resource Advocates, Conservation Colorado Education Fund, the Wilderness Society and Southern Utah Wilderness Alliance. Intervenor-Respondents: Independent Petroleum Association of American and Western Energy Alliance. Filed September 30, 2015; http://www.wyd.uscourts.gov/pdfforms/orders/15-cv-043%20130%20order.pdf(accessed 3/1/2016).
2. U.S. Environmental Protection Agency. Evaluation of Impacts to Underground Source of Drinking Water by Hydraulic Fracturing of Coalbed Methane Reservoirs, Office of Water, Office of Ground Water and Drinking Water (4606M), EPA 816-R-04-003, June 2004.
3. U.S. Environmental Protection Agency. Permitting Guidance for Oil and Gas Hydraulic Fracturing Activities Using Diesel Fuels: Underground Injection Control Program Guidance #84, Office of Water, EPA 816-R-14-001, February 2014.