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to phrases
E-layer
stat., commun., scient.
strato E
E layer
earth.sc.
strato E
;
strato anulare di elettroni relativistici
radio
regione E
E layer
normal
radio
starto E
normale
E-layer:
12 phrases
in 4 subjects
Astronomy
3
Communications
1
Electronics
6
Radio
2
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