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General Services Administration. (April 30, 2020). Ranking of the top 20 U.S. NASA contractors in fiscal year 2019, by contract value (in million U.S. dollars) [Graph]. In Statista. Retrieved March 07, 2021, from https://www.statista.com/statistics/445838/ranking-of-the-biggest-us-dod-contractors/
General Services Administration. "Ranking of the top 20 U.S. NASA contractors in fiscal year 2019, by contract value (in million U.S. dollars)." Chart. April 30, 2020. Statista. Accessed March 07, 2021. https://www.statista.com/statistics/445838/ranking-of-the-biggest-us-dod-contractors/
General Services Administration. (2020). Ranking of the top 20 U.S. NASA contractors in fiscal year 2019, by contract value (in million U.S. dollars). Statista. Statista Inc.. Accessed: March 07, 2021. https://www.statista.com/statistics/445838/ranking-of-the-biggest-us-dod-contractors/
General Services Administration. "Ranking of The Top 20 U.S. Nasa Contractors in Fiscal Year 2019, by Contract Value (in Million U.S. Dollars)." Statista, Statista Inc., 30 Apr 2020, https://www.statista.com/statistics/445838/ranking-of-the-biggest-us-dod-contractors/
General Services Administration, Ranking of the top 20 U.S. NASA contractors in fiscal year 2019, by contract value (in million U.S. dollars) Statista, https://www.statista.com/statistics/445838/ranking-of-the-biggest-us-dod-contractors/ (last visited March 07, 2021)
