20th century Great Britain Foreign relations 2 History 2 19th century 1 Aeronautics 1 Foreign relations 1837-1901 1 Historiography 1 History, Naval 1 Naval operations, British 1 Study and teaching 1 Technological innovations 1 Technology and international affairs 1 World War, 1914 - 1918 1 World War, 1914-1918 1 World War, 1939-1945 1 World war, 1914 - 1918 1