Stamps of United Nations - UN offices in Vienna, 0.20€ denom
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postage
2003, Oct 24 UNESCO World Heritage - United States issue unwmk p. 14.5
| - | 0.20€ | multi | Hawaii Volcanoes National Park | |||
| - | 0.20€ | multi | Everglades National Park | |||
| - | 0.20€ | multi | Yellowstone National Park |
2010, Apr 15 International Year of Biodiversity issue p. 13
| - | 0.20€ | multi |
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