File:Botanical Congress 6c 1969 issue U.S. stamps.jpg
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Categories:
- 1969 stamps of the United States
- Commemorative stamps of the United States
- XI International Botanical Congress
- Plants on stamps
- Pseudotsuga menziesii (illustrations)
- Cypripedium reginae on stamps
- Franklinia alatamaha - botanical illustrations
- Fouquieria splendens
- Deserts on stamps
- Forests on stamps
- Wetlands on stamps
- Flowers on stamps
- Groups of 4