5.54 in the Radio Frequency Table Allocation of Ireland.

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Content Type

ITU FOOTNOTE

Title

5.54

Description

Administrations conducting scientific research using frequencies below 9 kHz are urged to advise other administrations that may be concerned in order that such research may be afforded all practicable protection from harmful interference.

Source

https://search.itu.int/history/HistoryDigitalCollectionDocLibrary/1.43.48.en.101.pdf