Disasters induced by geophysical effects
Earthquakes Tsunamis
 1957/58 : IGY-Campaign
IGY: International Geophysical Year
 Congresses of Geophysical interest
IUGG: Int.Union Geodesy Geophysics
 Geophysically relevant cruises of ships
Cruises of ship Polarstern
 Geophysicists on stamps
Eötvös, Loránd Mercalli, Guiseppe Mohorovičić, Andrija Wegener, Alfred Wiechert, Emil
 more Geophysicists on stamps

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Philatelic Objcts with topic: Gravimetry on 23.11.2020