"Tabiiy suvlar sifatini yaxshilash" fanidan kurs loyihasini bajarish bo’yicha
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"Tabiiy suvlar sifatini yaxshilash" fanidan kurs loyihasini bajarish bo’yicha

2011
O‘quv qo‘llanma

Ruxsat
Open access emas
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PDF
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O‘zbekcha
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548.09 KB