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Office of Electronic Communications. (September 9, 2020). Volume of data transmission from mobile phones in international roaming in Poland from 2010 to 2019 (in terabytes) [Graph]. In Statista. Retrieved January 28, 2021, from https://www.statista.com/statistics/1025960/poland-data-usage-volume-in-outbounding-roaming/
Office of Electronic Communications. "Volume of data transmission from mobile phones in international roaming in Poland from 2010 to 2019 (in terabytes)." Chart. September 9, 2020. Statista. Accessed January 28, 2021. https://www.statista.com/statistics/1025960/poland-data-usage-volume-in-outbounding-roaming/
Office of Electronic Communications. (2020). Volume of data transmission from mobile phones in international roaming in Poland from 2010 to 2019 (in terabytes). Statista. Statista Inc.. Accessed: January 28, 2021. https://www.statista.com/statistics/1025960/poland-data-usage-volume-in-outbounding-roaming/
Office of Electronic Communications. "Volume of Data Transmission from Mobile Phones in International Roaming in Poland from 2010 to 2019 (in Terabytes)." Statista, Statista Inc., 9 Sep 2020, https://www.statista.com/statistics/1025960/poland-data-usage-volume-in-outbounding-roaming/
Office of Electronic Communications, Volume of data transmission from mobile phones in international roaming in Poland from 2010 to 2019 (in terabytes) Statista, https://www.statista.com/statistics/1025960/poland-data-usage-volume-in-outbounding-roaming/ (last visited January 28, 2021)
