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grey humic acid
environ., agric. ácido húmico gris
grey: 340 phrases in 38 subjects
Agriculture27
Botany4
Chemistry9
Communications6
Earth sciences4
Economy2
Electronics3
Entomology15
Environment12
Finances5
Fish farming pisciculture48
Food industry1
General8
Health care4
Ichthyology6
Industry29
Information technology6
International Monetary Fund1
Law1
Life sciences20
Lighting other than cinema1
Materials science1
Medical17
Metallurgy6
Microbiology1
Natural resourses and wildlife conservation40
Natural sciences32
Nuclear physics1
Packaging5
Pest control4
Radio4
Remote sensing2
Soil science4
Technology1
Textile industry2
United Nations2
Video recording5
Waste management1