Argentina

1991 Birds

1991 Iberia-Latin America Philatelic Literature Exhibition “IBEROPRENFIL” – Buenos Aires

1991 Anniversaries

1991 Anniversaries

1991 Christmas, Stained Glass Windows from Church of Our Lady of Lourdes, Santos Lugares, Buenos Aires

1991 America, Voyages of Discovery

1991 The 400th Anniversary of the La Rioja City

1991 The 75th Anniversary of the Crossing of Andes by Balloon

1991 Comic Strips

1991 The 700th Anniversary of the Swiss Confederation