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SSTI. (October 1, 2018). Number of metro system openings worldwide per decade between 1860 and 2017, by region [Graph]. In Statista. Retrieved February 28, 2021, from https://www.statista.com/statistics/934704/metro-system-openings-worldwide-by-region/
SSTI. "Number of metro system openings worldwide per decade between 1860 and 2017, by region ." Chart. October 1, 2018. Statista. Accessed February 28, 2021. https://www.statista.com/statistics/934704/metro-system-openings-worldwide-by-region/
SSTI. (2018). Number of metro system openings worldwide per decade between 1860 and 2017, by region . Statista. Statista Inc.. Accessed: February 28, 2021. https://www.statista.com/statistics/934704/metro-system-openings-worldwide-by-region/
SSTI. "Number of Metro System Openings Worldwide per Decade between 1860 and 2017, by Region ." Statista, Statista Inc., 1 Oct 2018, https://www.statista.com/statistics/934704/metro-system-openings-worldwide-by-region/
SSTI, Number of metro system openings worldwide per decade between 1860 and 2017, by region Statista, https://www.statista.com/statistics/934704/metro-system-openings-worldwide-by-region/ (last visited February 28, 2021)
