LABAK-MECHOWSKA, EWA. VARIABILITY OF GEOLOGICAL AND ENGINEERING CONDITIONS IN RIVER VALLEYS: THE EXAMPLE OF THE UPPER VISTULA RIVER VALLEY. Bulletin of Geography. Physical Geography Series. Online. 16 March 2015. No. 7, pp. 121-137. [Accessed 18 July 2024]. DOI 10.2478/bgeo-2014-0006.