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Commemorative Stamp to Honor XI International Botanical Congress, 1969
11th International Botanical Congress, 1969
International Botanical Congress, 1969
XI International Botanical Congress : Seattle, Washington, U.S.A., August 24-September 2, 1969 : second circular - September 1, 1968
- Title:
- Eleventh International Botanical Congress
- International Botanical Congress, 1969
- Second circular - September 1, 1968