Aleksandr S. Frid & Tatiana I. Borisochkina 2021. Studies on Vertical Migration of Pollutants in the Soils of the Orenburg Technogenic Biogeochemical Province . Emerging Challenges in Environment and Earth Science Vol. 1. (Nov. 2021), 13–27. DOI:https://doi.org/10.9734/bpi/ecees/v1/4762F.