Stamps, Geophysics design type
1 to 5 of 5
German Democratic Republic
postage1980, Nov 11 Geophysics unwmk (no perf info) (5 stamps)
| - | 20pf | multi | Gravimetry | |||
| - | 25pf | multi | Bohrlochmessung | |||
| - | 35pf | multi | Seismic | |||
| - | 50pf | multi | Seismology | |||
| - | 130pf | multi | — | — |
1 to 5 of 5