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observation well
agric., construct.	Beobachtungsbrunnen m; Grundwassermessstelle f
mech.eng., construct.	Kontrollschacht m; Beobachtungsschacht m
mining.	Pegelbrunnen m
nat.res.	Beobachtungsbohrung f; Grundwasserbeobachtungsrohr n; Kontrollpegel m; Probenahmebrunnen m

observation well: 3 phrases in 3 subjects

Construction	1
General	1
Natural resourses and wildlife conservation	1