Search for: [Subject and Keywords = eutrophication] OR [Subject and Keywords = nitrogen] OR [Subject and Keywords = phosphorus] OR [Subject and Keywords = land use] OR [Subject and Keywords = long\-term study] OR [Title = Seasonal and long\-term export rates of nutrients with surface runoff in the river Jorka catchment basin \(Masurian Lakeland, Poland\)] OR [Creator = Rybak, Joanna]