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common1945-1980
XIth International Botanical Congress Issue
United States · 1969 · 6¢
A set of four 6-cent U.S. stamps, each depicting a different plant species, issued to commemorate the XIth International Botanical Congress.
These stamps were issued to mark the XIth International Botanical Congress, a significant international scientific gathering for botanists, held in Seattle, Washington, in 1969.
Printing Method
Offset
Image: Bureau of Engraving and Printing. Designed by Stanley W. Galli. · License: Public domain
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