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Observations needed to provide basic indices for ionospheric propagation

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Opinion 23

Main
Number	Title	Status
Op.23-7(2016)	Observations needed to provide basic indices for ionospheric propagation	In force (Main)

Previous versions
Number	Title	Status
Op.23-6 (1999)	Observations needed to provide basic indices for ionospheric propagation	Superseded

General Secretariat and ITU Telecom

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