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*24510$aSome experimental studies of the ionospheric d region at high latitudes :$btechnical note no. 3, contract AF-61(052)-599$cO. Holt
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*4901 $aNDRE report$vno. 46
*533  $aElektronisk reproduksjon$b[Norge]$cNasjonalbiblioteket Digital$d2008-07-15
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