1962 Poland
1975 Liberia
1981 German Democratic Republic
1981 Maldive Islands
1973 Hungary
1976-77 Maldive Islands
1973 Liberia
1993 Belarus
1957 Israel
1976 Liberia
1972 Liberia
First commemorative stamps of the 20th century.
Columbus stamp promoted the 1893 Chicago World Columbian Exposition.
A single stamp to cover the one-pound air parcel rate in 1952.