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