[1]
Widera, M. 2012. Macroscopic lithotype characterisation of the 1st Middle-Polish (1st Lusatian) Lignite Seam in the Miocene of central Poland. Geologos. 18, 1 (Apr. 2012), 1–11. DOI:https://doi.org/10.2478/v10118-012-0001-5.