Szukana fraza: [Abstract = "Analyses of cartographic material conducted with use of GIS programmes allowed to ascertain the influence of hydrotechnical works on decrease of the open water surface. The greatest escalation of this process was observed between 1830\-1888 \(construction of ditches\) and in 1936\-1948 \(lowering of the water surface level\)."]

Wyników: 1