Widera M. Macroscopic lithotype characterisation of the 1st Middle-Polish (1st Lusatian) Lignite Seam in the Miocene of central Poland. logos [Internet]. 2012 Apr. 6 [cited 2024 May 17];18(1):1-11. Available from: https://pressto.amu.edu.pl/index.php/logos/article/view/v10118-012-0001-5