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OECD. (May 17, 2020). Amount of money invested in rail transport infrastructure in Poland from 2004 to 2018 (in million euros) [Graph]. In Statista. Retrieved March 02, 2021, from https://www.statista.com/statistics/438442/investment-in-rail-transport-infrastructure-in-poland/
OECD. "Amount of money invested in rail transport infrastructure in Poland from 2004 to 2018 (in million euros)." Chart. May 17, 2020. Statista. Accessed March 02, 2021. https://www.statista.com/statistics/438442/investment-in-rail-transport-infrastructure-in-poland/
OECD. (2020). Amount of money invested in rail transport infrastructure in Poland from 2004 to 2018 (in million euros). Statista. Statista Inc.. Accessed: March 02, 2021. https://www.statista.com/statistics/438442/investment-in-rail-transport-infrastructure-in-poland/
OECD. "Amount of Money Invested in Rail Transport Infrastructure in Poland from 2004 to 2018 (in Million Euros)." Statista, Statista Inc., 17 May 2020, https://www.statista.com/statistics/438442/investment-in-rail-transport-infrastructure-in-poland/
OECD, Amount of money invested in rail transport infrastructure in Poland from 2004 to 2018 (in million euros) Statista, https://www.statista.com/statistics/438442/investment-in-rail-transport-infrastructure-in-poland/ (last visited March 02, 2021)