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postage
1953, Apr 24
unwmk (no perf info)
1956, Apr 6
1957, Apr 8
UN Emergency Force issue
1958, Apr 14
1960, Apr 11
1961, Apr 17
International Monetary Fund issue
1967, Apr 28
EXPO 67 issue -
allegorical figures (5 stamps)
1968, Apr 18
UN Industrial Development Organization issue
1969, Apr 21
Peace Through International Law issue
1971, Apr 13
World Food Programme issue
1972, Apr 7
World Health Day 1972 issue
1973, Apr 13
Stop Drug Abuse Campaign issue
1976, Apr 23
U.N. Conference on Trade and Development 1976 issue
1977, Apr 22
United Nations Water Conference 1977 issue
1981, Apr 15
Art issue
1983, Apr 22
World Food Program issue
1984, Apr 18
World Heritage - UNESCO 1984 issue
1989, Apr 21
25th Anniversary of World Weather Watch issue
1994, Apr 29
United Nations High Commissioner for Refugees 1994 issue
1994, Apr 29
1994 issue
1999, Apr 22
Endangered Species 1999 issue -
endangered species (1999 United Nations)
2000, Apr 6
Endangered Species (2000 United Nations)
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