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Felsen m -s, =
gen.	rock; rocks
met.	stone; bluff
tech.	cliff
Fels m -en, -en
gen.	rock (mineral); crag
agric.	cliff
construct.	rock, rocky ground
met.	stone
mining.	rock

Felsen: 43 phrases in 15 subjects

Agriculture	1
Amphibians and reptiles	3
Construction	1
Earth sciences	1
Environment	2
General	7
Life sciences	4
Mammals	4
Medical	1
Metallurgy	1
Mining	11
Natural resourses and wildlife conservation	1
Natural sciences	1
Ornithology	3
Zoology	2