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200 10$aRefractivity gradients in the Northern Hemisphere$b[electronic resource] /$fC.A. Samson
210  1$a[Washington, D.C.] :$cU.S. Dept. of Commerce, Office of Telecommunications,$d[1975]
215   $a1 online resource (iii, 121 pages) $cillustrations
225 1 $aOT report ;$v75-59
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300   $a"April 1975."
320   $aIncludes bibliographical references (pages 15-16).
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606   $aAtmospheric radio refractivity
606   $aRawinsondes
606   $aRefraction
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