Gregor von Helmersen

Gregor von Helmersen or Grigory Petrovich Helmersen (, – ) was a Baltic German geologist. Provided by Wikipedia
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Participants: Helmersen, Gregor von 1803-1885 [ VerfasserIn ]
Published: 1872
Superior document: Sonderdruck aus Bulletin der Kaiserlichen Akademie der Wissenschaften von St. Petersburg T. 17, Seite 295-307