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opensecrets.org. (October 15, 2020). Leading oil & gas companies by lobbying expenditure in the United States in 2020 (in U.S. dollars) [Graph]. In Statista. Retrieved January 21, 2021, from https://www.statista.com/statistics/536273/lobbying-expenditures-of-key-oil-companies-in-the-us/
opensecrets.org. "Leading oil & gas companies by lobbying expenditure in the United States in 2020 (in U.S. dollars)." Chart. October 15, 2020. Statista. Accessed January 21, 2021. https://www.statista.com/statistics/536273/lobbying-expenditures-of-key-oil-companies-in-the-us/
opensecrets.org. (2020). Leading oil & gas companies by lobbying expenditure in the United States in 2020 (in U.S. dollars). Statista. Statista Inc.. Accessed: January 21, 2021. https://www.statista.com/statistics/536273/lobbying-expenditures-of-key-oil-companies-in-the-us/
opensecrets.org. "Leading Oil & Gas Companies by Lobbying Expenditure in The United States in 2020 (in U.S. Dollars)." Statista, Statista Inc., 15 Oct 2020, https://www.statista.com/statistics/536273/lobbying-expenditures-of-key-oil-companies-in-the-us/
opensecrets.org, Leading oil & gas companies by lobbying expenditure in the United States in 2020 (in U.S. dollars) Statista, https://www.statista.com/statistics/536273/lobbying-expenditures-of-key-oil-companies-in-the-us/ (last visited January 21, 2021)
