leonyang98266@gmail.com

1984 Airmail – The 45th Congress of Americanists, Bogota

1984 Airmail – Marandua, City of the Future

1984 Marandua, City of the Future

1984 The 100th Anniversary of the Death of Candelario Obeso, 1849-1884

1984 The 150th Anniversary of the Birth of Diego Fallon, 1834-1905

1984 The 100th Anniversary of the Birth of Luis A. Cabo, 1884-1945

1984 The 200th Anniversary of the Birth of Jose Prudencio Padilla, 1784-1828

1984 Airmail – Exports – Coffee

1984 Francisco de Paula Santander

1983 Airmail – The 75th Anniversary of Boy Scout Movement