Polar session - Arctic environment research, Lublin, Poland - April 1991 / [oprac. red. Janina Repelewska-Pękalowa, Kazimierz Pękala ; tł. Maria Charmas et al.] ; Institute of Earth Sciences Maria Curie-Skłodowska University. Permafrost Commission of Committee on Polar Research Polish Academy of Sciences. - Charmas, Maria (Spitsbergen Geographical Expeditions, 1991)