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Ionosfera (7)
Geomagnetism (5)
55 - Earth Sciences. Geological sciences (4)
Ones de ràdio (3)
02 - Librarianship (2)
53 - Physics (2)
537 - Electricity. Magnetism. Electromagnetism (2)
Geomagnetisme (2)
Observatori de l'Ebre (2)
Ràdio--Freqüència modulada (2)
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