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