United States
0.18 - 0.22$
price on 25.03.2023
| Country: | United States |
| Type: | Postage stamps |
| Series: | Knoxville World's Fair |
| Nominal: | 20 ¢ |
| Year: | 1982 |
| Perforation: | line 11 |
Knoxville World's Fair
 Solar Energy 0.28$ |  Synthetic Fuels 0.15$ |  Breeder Reacter 0.18$ |  Fossil Fuels |