Stamps of United States, 21 Feb 2007
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postage
2007, Feb 21 International Polar Year issue - auroras (2007) unwmk p. 11
| - | 84 | dkpur & multi | aurora borealis | — | — | |
| - | 84 | dkpur & multi | aurora australis | — | — |
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| - | 84 | dkpur & multi | aurora borealis | — | — | |
| - | 84 | dkpur & multi | aurora australis | — | — |