Search for: [Subject and Keywords = regional natural environment \-\- Poland] OR [Subject and Keywords = Świdry Wielkie \(Otwock, Poland\)] OR [Subject and Keywords = Otwock, Masovian voivodeshiip \(Poland\)] OR [Subject and Keywords = Świder Valley \(Poland\)] OR [Subject and Keywords = środowisko naturalne regionu \-\- Polska] OR [Subject and Keywords = Świdry Wielkie \(Otwock, Polska\)] OR [Subject and Keywords = Otwock, woj. mazowieckie \(Polska\)] OR [Subject and Keywords = Świdra dolina \(Polska\)] OR [Title = Świdry Wielkie \: rzeka Świder] OR [Creator = Sawicki, Ludwik \(1893–1972\)]