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UITP. (September 12, 2018). Metro systems length from 2013 to 2017, by region (in kilometers) [Graph]. In Statista. Retrieved April 23, 2021, from https://www.statista.com/statistics/561823/infrastructure-development-of-metro-networks-worldwide/
UITP. "Metro systems length from 2013 to 2017, by region (in kilometers)." Chart. September 12, 2018. Statista. Accessed April 23, 2021. https://www.statista.com/statistics/561823/infrastructure-development-of-metro-networks-worldwide/
UITP. (2018). Metro systems length from 2013 to 2017, by region (in kilometers). Statista. Statista Inc.. Accessed: April 23, 2021. https://www.statista.com/statistics/561823/infrastructure-development-of-metro-networks-worldwide/
UITP. "Metro Systems Length from 2013 to 2017, by Region (in Kilometers)." Statista, Statista Inc., 12 Sep 2018, https://www.statista.com/statistics/561823/infrastructure-development-of-metro-networks-worldwide/
UITP, Metro systems length from 2013 to 2017, by region (in kilometers) Statista, https://www.statista.com/statistics/561823/infrastructure-development-of-metro-networks-worldwide/ (last visited April 23, 2021)
