Twardy, Juliusz, et al. “Periods of Intense Human Impact in Central Poland Recorded in Aeolian, Slope, Fluvial and Organic Deposits: Https: doi.Org 10.26485 AGL 2018 107 7”. Acta Geographica Lodziensia, vol. 107, Dec. 2018, pp. 119-36, https://czasopisma.ltn.lodz.pl/Acta-Geographica-Lodziensia/article/view/210.