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Northern Domestic Airspace
avia., Canada As geographically delineated in the Designated Airspace Handbook DAH, a subdivision of Canadian Domestic Airspace CDA commencing at the North Pole and extending southward to the northern limit of the Southern Domestic Airspace (SDA)
Northern: 35 phrases in 11 subjects
Agriculture1
Botany1
Construction1
Economy8
Environment3
Fish farming pisciculture1
General1
Geography4
Life sciences7
Natural resourses and wildlife conservation3
Politics5