Poland : travel guide. [7, Water tourist routes] / ed. Zofia Uszyńska ; [auth. Stanisław Jakimowicz et al. ; transl. from Polish by Witold Z. Kulerski and Jerzy Dłutek]. - Jakimowicz, Stanisław; Kulerski, Witold (1911-1997); Dłutek, Jerzy (Agpol, 1960)