Stamps of Vietnam, World Heritage issue
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postage
2006, Jun 1 World Heritage issue unwmk p. 13
| - | 800d | multi | Bi Ky Cave (Phong Nha Cavern) | |||
| - | 4000d | multi | Xuyen Son Cavern | |||
| - | 8000d | multi | Nuoc Moc stream | |||
| - | 12000d | multi | Tien Cave (Phong Nha Cavern) |
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