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1837-1908
4
1869-1870
4
Arctic regions
4
Deutsche Nordpolar-Expedition
4
Discovery and exploration
4
Geophysics
4
German
4
Karl
4
Koldewey
4
Natural history
4
1869-1870)
2
Geodesy
2
Geology
2
Geomagnetism
2
Germania (Schooner)
2
Greenland
2
Hansa (Schooner)
2
Hydrography
2
Meteorology
2
Scientific Expeditions
2
Shipwreck survival
2
Technical reports
2
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