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Argiri, A. , Molla, A. , Tzouvalekas, T. , Skoufogianni, E. , Danalatos, N.. "A Study of Soil Heavy Metal Pollution in the Manganese Mining in Drama, Greece". World Academy of Science, Engineering and Technology, Open Science Index 172, International Journal of Geological and Environmental Engineering (2021), 15(4), 147 - 150.