1958 Airmail – The 100th Anniversary of the Birth of Rafael Maria Arizaga, 1858-1933 1958 Airmail – Inauguration of Gonzalo Icaza Cornejo Bridge 1958 The 50th Anniversary of Opening of Guayaquil-Quito Railway 1958 Airmail – South American Basketball Champions’ Tournament, Quito 1958 Airmail – The 3rd National Eucharistic Congress, Guayaquil 1958 Airmail – The 3rd National Eucharistic Congress, Guayaquil 1958 Airmail – National Stamp Exbhibition “EXFIGUA” – Guayaquil, Ecuador 1958 Tropical Birds 1958 Inauguration of UNESCO Headquarters Building, Paris 1958 Airmail – Imbabura Cantonal Arms 1958 Airmail – The 400th Anniversary of the Death of Emperor Charles V, 1500-1558 1958 International Geophysical Year 1958 Airmail – Paul Rivet Commemoration, 1876-1958 1959 Airmail – The 75th Anniversary of “El Telegrafo” 1959 Airmail – The 100th Anniversary of the Death of Alexander von Humboldt, 1769-1859 1959 Airmail – The 100th Anniversary of the Birth of Alfredo Baquerizo Moreno, 1859-1931, and Jose Lluis Tamayo, 1858-1947 1959 Airmail – The 150th Anniversary of Independence 1959 Virgin of Quito 1959 Airmail – Pope Pius XII Commemoration, 1876-1958 1959 Airmail – Organization of American States Commemoration