1989 Airmail – The 100th Anniversary of the Birth of Agustin Nieto Caballero, 1889-1975
1989 Airmail – The 100th Anniversary of the Birth of Agustin Nieto Caballero, 1889-1975
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1988 Airmail – Nature Conservation WM: 7
1988 Airmail – Nature Conservation WM: 7
1988 Airmail – Pre-Columbian Art Treasures
1988 Airmail – Pre-Columbian Art Treasures
1988 Airmail – Zipa Tisquesusa, 16th-century Indian Chief
1988 Airmail – Zipa Tisquesusa, 16th-century Indian Chief
1988 The 100th Anniversary of the Birth of Eduardo Santos, 1888-1974
1988 The 100th Anniversary of the Birth of Eduardo Santos, 1888-1974