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Twitter (@energyinstratPL). (July 16, 2021). Number of employees in hard coal and lignite mining in Poland in 2019 (in 1,000s) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 26, 2026, from /statistics/1256355/poland-employees-in-hard-coal-and-lignite-mining/
Twitter (@energyinstratPL). "Number of employees in hard coal and lignite mining in Poland in 2019 (in 1,000s)." Chart. July 16, 2021. ÌÇÐÄÆƽâ°æ. Accessed July 26, 2026. /statistics/1256355/poland-employees-in-hard-coal-and-lignite-mining/
Twitter (@energyinstratPL). (2021). Number of employees in hard coal and lignite mining in Poland in 2019 (in 1,000s). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 26, 2026. /statistics/1256355/poland-employees-in-hard-coal-and-lignite-mining/
Twitter (@energyinstratPL). "Number of Employees in Hard Coal and Lignite Mining in Poland in 2019 (in 1,000s)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 16 Jul 2021, /statistics/1256355/poland-employees-in-hard-coal-and-lignite-mining/
Twitter (@energyinstratPL), Number of employees in hard coal and lignite mining in Poland in 2019 (in 1,000s) ÌÇÐÄÆƽâ°æ, /statistics/1256355/poland-employees-in-hard-coal-and-lignite-mining/ (last visited July 26, 2026)
Number of employees in hard coal and lignite mining in Poland in 2019 (in 1,000s) [Graph], Twitter (@energyinstratPL), July 16, 2021. [Online]. Available: /statistics/1256355/poland-employees-in-hard-coal-and-lignite-mining/
