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1837-1908
1869-1870
6
Arctic regions
Deutsche Nordpolar-Expedition
6
Discovery and exploration
6
Geophysics
German
Karl
6
Koldewey
6
Natural history
6
1869-1870)
4
Geodesy
4
Geology
4
Geomagnetism
4
Germania (Schooner)
4
Greenland
4
Hansa (Schooner)
4
Hydrography
4
Meteorology
4
Scientific Expeditions
4
Shipwreck survival
4
Technical reports
4
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