Search for: [Subject and Keywords = regional natural environment \-\- Poland] OR [Subject and Keywords = Brok, Ostrów Mazowiecka county, mazowieckie voivodeship\-region \(Poland\)] OR [Subject and Keywords = środowisko naturalne regionu \-\- Polska] OR [Subject and Keywords = Brok, pow. Ostrów Mazowiecka, pow. mazowieckie\-region \(Polska\)] OR [Title = Brok \: widok na rzekę Bug z mostu] OR [Creator = Sawicki, Ludwik \(1893–1972\)]