The Position in Space of the Aurora Polaris from Observations made at the Haldde-Observatory 1913-1914. []

Utgitt: Kristiania,
1920
4to. 172 pp. + XXIX b&w plates of which 3 folding. Publisher’s wrappers, worn, loose. Text block very good.
Kommentar: Geofysiske publicationer Vol. 1 No. 1.Utgitt av Den Geofysiske Kommission. With ded. from the authers. Northern light – Aurora Borealis.

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The Position in Space of the Aurora Polaris from Observations made at the Haldde-Observatory 1913-1914. []