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200 1 $aAnnual report of the director of the Department of Terrestrial Magnetism$fCarnegie Institution of Washington
210   $aWashington$c[s.n.$d1950?]
215   $aP. 61-81$d26 cm
300   $aEstratto da: Carnegie Institution of Washington Year Book n. 49, for the year 1949-1950, issued December 15, 1950
500 10$aAnnual report of the director of the Department of Terrestrial Magnetism$959726
610 1 $aMagnetismo terrestre$aOsservazioni
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996   $aAnnual report of the director of the Department of Terrestrial Magnetism$959726
997   $aUNIPARTHENOPE