South America

1957 The 50th Anniversary of the Argentine Oil Industry WM: 9

1957 Airmail – International Correspondence Week WM: 9

1957 Reform Convention WM: 9

1957 Airmail – International Tourist Congress, Buenos Aires WM: 9

1957 Esteban Echeverria, Writer WM: 9

1957 The 100th Anniversary of the Argentine Railways WM: 9

1957 Airmail, Inter-American Economic Conference WM: 9

1957 The 150th Anniversary of the Defence of Buenos Aires WM: 9

1957 Roque Saenz Pena, Statesman WM: 9

1957 Airmail – The 100th Anniversary of the Death of Admiral Guillermo Brown WM: 9