Topic
Arctic regions
99
Scientific Expeditions
36
Natural history
25
Greenland
18
Hydrography
16
Iceland
15
Geophysics
14
Ingolf (Ship)
12
Marine biology
12
Diptera
11
Discovery and exploration
10
Paleobotany
10
Norway
8
1837-1908
6
1869-1870
6
Birds
6
Description and travel
6
Deutsche Nordpolar-Expedition
6
Fram (Ship)
6
German
6
Karl
6
Koldewey
6
Observations
6
Spitsbergen
6
Russia
5
1869-1870)
4
Arctic Ocean
4
Bryozoa
4
Canadian
4
Crabs
4
Crustacea
4
Geodesy
4
Geology
4
Geomagnetism
4
Germania (Schooner)
4
Germany
4
Hansa (Schooner)
4
Meteorology
4
Northwest
4
Scandinavia
4
Shipwreck survival
4
Technical reports
4
ddc:550
4
Alaska
3
Arctic
3
Canada
3
Culture
3
Fishes
3
Jellyfishes
3
Québec
3
more ...