Technogenic magnetic particles of topsoil from different sources of emission - A case study from upper silesian conurbation, PolandMaria Magdalena Szuszkiewicz, Adam Łukasik, Tadeusz Magiera and Marcin SzuszkiewiczMATEC Web Conf., 247 (2018) 00051DOI: https://doi.org/10.1051/matecconf/201824700051