Partner. Carl F. Hemsen. Stelvetite -DEXTRA Photo / DigitaltMuseum

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Attrbution-ShareAlike (CC BY-SA) — Partner. Carl F. Hemsen. Stelvetite Photo: Solvang, Frits / DEXTRA Photo

Attrbution-ShareAlike (CC BY-SA) — Partner. Carl F. Hemsen. Stelvetite Photo: Solvang, Frits / DEXTRA Photo