German Democratic Republic (GDR, East Germany)

Deutsche Demokratische Republik (DDR) 

1980 Nov. 11th

Geophysics:

• Gravimetry;

• Borehole measurement, water exploration;

• Seismology;

• Seismology.

Catalogue Numbers: 

Michel DD 2557-2560
Stamp Number DD 2143-2146
Yvert et Tellier DD 2216-2219
Stanley Gibbons DD E2273-E2276
Unificato DD 2557-2560

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1980, 11. Nov. Geophysik. Gravimetrie; Bohrlochmessung, Wasser Erkundung; Seismik; Seismologie.