Search for: [Subject and Keywords = aquatic biology] OR [Subject and Keywords = lake ecology] OR [Subject and Keywords = Poland] OR [Subject and Keywords = Masurian Lakeland] OR [Subject and Keywords = Hydrobiologia \-\- Polska \-\- Mazurskie, Pojezierze] OR [Subject and Keywords = Ekologia jezior \-\- Polska \-\- Mazurskie, Pojezierze] OR [Title = Ecology of the eulittoral zone of lakes] OR [Creator = Pieczyńska, Ewa]