Topic
Arctic regions
16
Greenland
Hydrography
16
Scientific Expeditions
16
Iceland
12
Ingolf (Ship)
12
Marine biology
12
1837-1908
4
1869-1870
4
1869-1870)
4
Deutsche Nordpolar-Expedition
4
Discovery and exploration
4
Geodesy
4
Geology
4
Geomagnetism
4
Geophysics
4
German
4
Germania (Schooner)
4
Hansa (Schooner)
4
Karl
4
Koldewey
4
Meteorology
4
Natural history
4
Shipwreck survival
4
Technical reports
4