source noise

: 60 phrases in 16 subjects

Air defense	6
Astronomy	1
Automobiles	2
Aviation	2
Cryptography	3
Ecology	7
Electronics	7
Explosives and Explosive Ordnance Disposal	2
Geophysics	4
Health care	1
Information technology	1
Metallurgy	1
Nautical	3
Oil / petroleum	1
Project management	1
Technology	18