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RPN series : propagation in non-ionized media: CCIR recommendations (new and revised as of 8 October 1992) / International Telecommunication Union
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Propagation in non-ionized media : reports of the CCIR, 1990: (also decisions): annex to volume V / International Telecommunication Union
Atlas mondial de la conductivité du sol : rapport 717-2 / Union Internationale des Télécommunications