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Websites
- U.S. EPA. Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990–2015 EPA 430-P-17-001 (2017). Retrieved from https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-and-sinks-1990-2015.
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- PA DEP. Pennsylvania's Plan for Addressing Problem Abandoned Wells and Orphaned Wells ( DEP Document No. 550-0800-001), Pennsylvania Department of Environmental Protection - Bureau of Oil and Gas Management, (2010). April 2010. Retrieved from http://www.elibrary.dep.state.pa.us/dsweb/Get/Version-48262/550-0800-001.pdf.
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- Pennsylvania Oil and Gas Act of 1984, 25 PA Code Chapter 78. Includes 2011 revisions. (2011). Retrieved from http://www.pacode.com/secure/data/025/chapter78/chap78toc.html.
- PA DCNR. Bureau of Topographic and Geologic Survey Historical Farmline Maps. (2016). Retrieved from http://www.dcnr.state.pa.us/topogeo/econresource/oilandgas/resrefs/farmline_maps/index.htm.
- U. S. EPA. Protocol for Equipment Leak Emission Estimates. EPA-453/R-95-017, Nov 1995 (1995). Retrieved from http://www.epa.gov/ttnchie1/efdocs/equiplks.pdf.