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200 10$aLow- and very low-radiofrequency tables of ground wave parameters for the spherical earth theory $ethe roots of Riccati's differential equation /$fJ.R. Johler, L.C. Walters, C.M. Lilley
210  1$aWashington, D.C. :$cNational Bureau of Standards, United States Department of Commerce, Office of Technical Services,$d[1959?]
215   $a1 online resource (86 pages)
225 1 $aNational Bureau of Standards technical note ;$vno. 7
300   $aTitle from title screen (viewed Mar. 4, 2014).
517   $aLow- and very low-radiofrequency tables of ground wave parameters for the spherical earth theory 
606   $aRadio wave propagation
606   $aRiccati equation
615  0$aRadio wave propagation.
615  0$aRiccati equation.
700   $aJohler$b J. Ralph$01401488
702   $aWalters$b L. C.
702   $aLilley$b C. M.
712 02$aUnited States.$bNational Bureau of Standards,
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996   $aLow- and very low-radiofrequency tables of ground wave parameters for the spherical earth theory$93522537
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