Vietnam
| Country: | Vietnam |
| Type: | Postage stamps |
| Series: | 30th Anniv. of Vietnamese Geological branch |
| Nominal: | 1 ₫ |
| Year: | 1985 |
| Size: | 41 x 30 mm |
| Perforation: | 11¾ |
30th Anniv. of Vietnamese Geological branch
 Locating deposits |  Geological research by airplane 0.07$ |