Search for: [Subject and Keywords = Mackinder] OR [Subject and Keywords = geopolityka] OR [Subject and Keywords = Heartland] OR [Title = Koncepcja Heartlandu Halforda Mackindera = Halford Mackinder's Heartland concept] OR [Title = Koncepcja Heartlandu Halforda Mackindera = Halford Mackinder's Heartland concept] OR [Creator = Eberhardt, Piotr \(1935–2020\)] OR [Creator = Eberhardt, Piotr \(1935–2020\)]