2015 Aitutaki
2015 Cook Islands
2016 Samoa
1992 Congo, People's Republic
2015 Penrhyn
2016 Penrhyn
2015 Tonga-Niuafo'ou
2015 Tonga
1996 Benin, People's Republic of
1977 Grenada
1972 Berlin
1981 Hungary
1984 Berlin
1881 Great Britain
Commemorative proof cards each feature a stamp from US #2991.
Fleetwood cover set celebrates 11th International Botanical Congress (1969).
For more than 75 years, the UN has worked toward international peace.