Mammoth Cave, longest cave 39 ¢ — United States, 2006
Mammoth Cave, longest cave (United States, 2006), face value 39 ¢, “Wonders of America” series. Photo, catalogue value, details and photo identification.
- Series
- Wonders of America
- Issue date
- 2006
- Face value
- 39 ¢
- Colors
- Multicolor
- Yvert
- US 3816
- Michel
- US 4113
- Stanley Gibbons
- US 4610
- Scott
- US 4068