Astronomical observations. Magnetical observations. Geography and natural history /
Mohn, H.
Astronomical observations. Magnetical observations. Geography and natural history / H. Mohn ; C. Wille. - Christiania : Grøndahl, 1882. - various pagings ; 37 cm. - The Norwegian North-Atlantic expedition, 1876-1878 = Den Norske Nordhavs-expedition, 1876-1878 .
Astronomical observations. Magnetical observations. Geography and natural history / H. Mohn ; C. Wille. - Christiania : Grøndahl, 1882. - various pagings ; 37 cm. - The Norwegian North-Atlantic expedition, 1876-1878 = Den Norske Nordhavs-expedition, 1876-1878 .