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Positive Control Airspace stresses
transp., abbr.	PCA

Positive Control : 72 phrases in 27 subjects

Air defense	1
Astronautics	1
Automated equipment	1
Aviation	4
Biotechnology	2
Chemistry	1
Clinical trial	1
Economics	1
Energy industry	1
General	1
Genetic engineering	1
Genetics	5
Immunology	1
Life sciences	1
Medical	5
Microbiology	1
Military	26
Missiles	1
Nanotechnology	3
Pharmacology	1
Pharmacy and pharmacology	3
Rail transport	1
Road works	1
Space	2
Technology	4
Virology	1
Weapons of mass destruction	1