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reference direction
earth.sc., tech.	Referenzrichtung f
life.sc.	Nullrichtung f
opt.	Bezugsrichtung f (e.g. in space)
phys.	Bezugsrichtung f
радиоакт.	Bezugsrichtung f (of an X-ray tube); Referenzrichtung f (of an X-ray tube)

reference direction: 2 phrases in 1 subject

Earth sciences

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