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région D
life.sc.	ionosphere D-region
radio	D layer
stat., commun., scient.	D region

Région d: 270 phrases in 41 subjects

Agriculture	5
Animal husbandry	1
Antennas and waveguides	4
Astronomy	2
Aviation	33
Biotechnology	2
Chemistry	1
Communications	2
Computers	1
Construction	7
Criminal law	3
Economy	7
Education	1
Electronics	17
Energy industry	3
Environment	5
Finances	4
Fish farming pisciculture	1
General	17
Genetics	8
Geography	2
Health care	5
Immigration and citizenship	2
International trade	1
Law	7
Life sciences	5
Marketing	1
Mathematics	10
Medical	2
Metallurgy	3
Name of organization	37
Natural resourses and wildlife conservation	7
Natural sciences	2
Nuclear physics	2
Politics	7
Rail transport	1
Statistics	6
Technology	1
Transport	19
United Nations	21
Радиоактивное излучение	5