Topic
1837-1908
5
1869-1870
5
1869-1870)
Arctic regions
5
Deutsche Nordpolar-Expedition
5
Discovery and exploration
5
Geodesy
5
Geology
5
Geomagnetism
5
Geophysics
German
5
Germania (Schooner)
5
Greenland
Hansa (Schooner)
5
Hydrography
Karl
5
Koldewey
5
Meteorology
5
Natural history
5
Scientific Expeditions
5
Shipwreck survival
5
Technical reports
5