New collaborative measures supporting aviation English Level 4 Proficiency training and testing
ICAO journal ; 64 , 3
2009
Aufsatz (Zeitschrift)
Englisch
BKL: | 55.88 Luftverkehr, Raumfahrt / 55.54 Flugführung | |
Lokalklassifikation TIB: | 385/7040/xxxx |
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