1. U.S. Energy Information Administration.Oil and petroleum products explained: where our oil comes from. Accessed August 14 2020.https://www.eia.gov/energyexplained/oil-and-petroleum-products/where-our-oil-comes-from.php
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4. Bureau of Labor Statistics.Table A‐1. Fatal occupational injuries by industry and event or exposure all United States 2019.2020. Accessed December 29 2020. https://stats.bls.gov/iif/oshwc/cfoi/cftb0331.htm
5. Motor vehicle fatalities among oil and gas extraction workers