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1954, May 10
ILO issue unwmk (no perf info)
1955, May 11
UNESCO issue
1959, May 18
UN Economic Commission for Europe issue
1962, May 25
1962 issue
1965, May 17
ITU 100th issue
1966, May 26
World Health Organization issue
1968, May 31
1970, May 22
1971, May 28
Opening of New U.P.U. Headquarters Building issue
1973, May 25
U.N. Volunteers Program issue
1974, May 6
Brazilian Peace Mural, Delegates' Lobby
1975, May 9
International Women's Year issue
1976, May 28
U.N. Conference on Human Settlements issue
1978, May 5
Namibia 1978 issue
1979, May 4
International Year of the Child issue
1980, May 16
peacekeeping operations issue
1981, May 29
New and Renewable Sources of Energy issue
1984, May 29
Future for Refugees issue
1985, May 10
1985 issue
1986, May 22
Philately - The International Hobby issue
1988, May 6
International Volunteer Day 1988 issue
1990, May 4
Medicinal Plants (1990 United Nations)
1991, May 10
1991, May 10
1st Anniversary of Namibian Independence issue
1992, May 22
2nd U.N. Conference on Environment and Development issue
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