Argentina

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

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

1956 The 250th Anniversary of the Birth of Benjamin Franklin WM: 9

1956 Florentino Ameghino, Anthropologist WM: 9

1956 -1959 Personalities WM: 9

1956 The 100th Anniversary of the First Argentine Stamps WM: 9

1956 Airmail – Infantile Paralysis Victims, Gratitude for Help WM: 9

1956 The First Anniversary of Revolution WM: 9