Search for: [Subject and Keywords = lakes] OR [Subject and Keywords = landscape] OR [Subject and Keywords = ecological state] OR [Subject and Keywords = Suwałki Landscape Park] OR [Title = Landscape structure and ecological state of lakes \- results of research in Suwałki Landscape Park \(north\-eastern Poland\) including suggestions for its protection] OR [Creator = Hillbricht\-Ilkowska, Anna] OR [Creator = Wiśniewski, Rajmund Jan]