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породы основные stresses
oil	basic rocks
порода основная
forestr.	basic timber species; basic tree species; principal timber species

породы основные: 45 phrases in 21 subjects

Cement	1
Construction	2
Ecology	1
Electronics	1
Forestry	1
Geology	13
Geophysics	1
Gold mining	1
Law	1
Makarov	4
Military	1
Mining	6
Nautical	1
Oil / petroleum	2
Oil and gas	2
Oil and gas technology	2
Oilfields	1
Ornithology	1
Rail transport	1
Road works	1
Seismology	1