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Atkritumi, to veidi, piesārņojums un ...
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Atkritumi, to veidi, piesārņojums un ietekme uz vidi
Elementary schoolPresentations6 -
Litosfēras piesārņojums - augsnes kvalitāte
Elementary schoolPresentations10 -
Sadzīves atkritumi un to pārstrāde
Elementary schoolPresentations17
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8,47 €
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4,49 €
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