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Bohrkern m
gen.	increment core
archaeol.	drilling core
life.sc.	drill core
met.	core sample
mining.	boring kernel; core borings; well core
phys.	carrot
transp.	core

Bohrkern: 10 phrases in 4 subjects

Coal	2
Metallurgy	2
Mining	4
Natural resourses and wildlife conservation	2