1957 Berlin
1958 Berlin
1966 Berlin
1965 Berlin
1969 Berlin
1973 Berlin
1956 Berlin
1975 Berlin
1960 Berlin
1962-63 Berlin
1963 Berlin
1970 Berlin
1974 Berlin
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.