Search for: [Subject and Keywords = Populus] OR [Subject and Keywords = poplars] OR [Subject and Keywords = systematics of poplars] OR [Subject and Keywords = variability of poplars] OR [Subject and Keywords = topola] OR [Subject and Keywords = Populus] OR [Subject and Keywords = systematyka topoli] OR [Subject and Keywords = zmienność topoli] OR [Title = Systematics and variability] OR [Title = Systematyka i zmienność] OR [Creator = Bugała, Władysław]