1974 Airmail – The 8th Inter-American Postmasters’ Congress, Auibo
1974 Airmail – The 8th Inter-American Postmasters’ Congress, Auibo
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1974 Airmail – Captain Edmundo Chiriboga, National Hero
1974 Airmail – Captain Edmundo Chiriboga, National Hero
1974 Airmail – The 50th Anniversary of the Death of Teodoro Wolf, Geographer, 1841-1924
1974 Airmail – The 50th Anniversary of the Death of Teodoro Wolf, Geographer, 1841-1924
1974 Francisco Campos Ruiadaneira, Entomologist
1974 Francisco Campos Ruiadaneira, Entomologist
1974 Pio Jaramillo Alvarado, Sociologist
1974 Pio Jaramillo Alvarado, Sociologist
1974 Airmail – The 100th Anniversary of U.P.U.
1974 Airmail – The 100th Anniversary of U.P.U.
1974 Airmail – OPEC, Oil Exporters, Meeting, Quito
1974 Airmail – OPEC, Oil Exporters, Meeting, Quito