1988 The 100th Anniversary of Bogota Water Supply and Sewerage Organization
1988 The 100th Anniversary of Bogota Water Supply and Sewerage Organization
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1988 Airmail – Pre-Columbian Art Treasures
1988 Airmail – Pre-Columbian Art Treasures
1988 The 40th Anniversary of Declaration of Human Rights WM: 7
1988 The 40th Anniversary of Declaration of Human Rights WM: 7
1988 Airmail – The 450th Anniversary of Bogota
1988 Airmail – The 450th Anniversary of Bogota
1988 Airmail – Rural Telephone Network
1988 Airmail – Rural Telephone Network
1987 Airmail – The 1st Meeting of Eight Latin-American Presidents of Contadora and Lima Groups, Acapulco, Mexico
1987 Airmail – The 1st Meeting of Eight Latin-American Presidents of Contadora and Lima Groups, Acapulco, Mexico
1987 Social Security and Communications
1987 Social Security and Communications