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πέτρα f
earth.sc.	roche f
econ.	pierre f

πέτρα: 128 phrases in 18 subjects

Agriculture	3
Art	1
Chemistry	2
Coal	1
Construction	6
Cultural studies	3
Earth sciences	1
Environment	3
General	3
Industry	76
Materials science	1
Mechanic engineering	1
Medical	7
Metallurgy	3
Municipal planning	6
Natural sciences	8
Technology	1
Transport	2