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Land magnetic observations
AurorasMaud Expedition (1918-1925)GeomagnetismObservationsAtmospheric electricityMaud Expedition, 1918-1925Maud Expedition (1918-1925) (uri) http://id.loc.gov/authorities/names/n2011049454 (uri) http://viaf.org/viaf/sourceID/LC|n2011049454
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Public-domain status shown for US. Open Library Read API reports full access; scan publication year 1912 is within the US public-domain cutoff
Public-domain status shown for US. Open Library Read API reports full access; scan publication year 1912 is within the US public-domain cutoff