Stamps of United States, 23 Aug 1969
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1969, Aug 23 11th International Botanical Congress issue - plants (1969) unwmk p. 11
| X | 6c | multi | Pseudotsuga menziesii | |||
| X | 6c | multi | Cypripedium reginae | |||
| X | 6c | multi | Fouquieria splendens | |||
| X | 6c | multi | Franklinia alatamaha |
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