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Ionosfera (6)
Ones de ràdio (3)
53 - Physics (2)
537 - Electricity. Magnetism. Electromagnetism (2)
Geomagnetism (2)
Geomagnetisme (2)
Ràdio--Freqüència modulada (2)
55 - Earth Sciences. Geological sciences (1)
621.3 Electrical engineering (1)
Comunicacions d'espectre eixamplat (1)
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