1. The scientific results of the Norwegian Arctic Expedition in the Gjöa, 1903–1906: Part II;Steen,1933
2. Geofys. Pub.;Graarud,1905
3. Erdmagnetismus und Polarlicht;Nippoldt;Einführung in die Geophysik,1929
4. Studies on the quiet diurnal variation of magnetic elements;Trumpy;Trondheim, kgl. Vid. selsk. Skr.,1937
5. Results from the magnetic station at Dombůs, 1916–33;Krogness,1936