leonyang98266@gmail.com

1981 Airmail – The 100th Anniversary of Admission to UPU

1981 Airmail – Calima Culture

1981 Presidents of Colombia

1981 Airmail – The 200th Anniversary of the Birth of Andres Bello

1981 Los Nevados National Park

1981 The 50th Anniversary of Caja Agraria

1981 Airmail – The 200th Anniversary of the Birth of Jose Manuel Restrepo

1981 West Bridge, Santa Fe de Antioquia

1981 Airmail – The 200th Anniversary of Comuneros Uprising

1981 Presidents of Colombia