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Atkritumi. Noturīgie organiskie piesā...
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Atkritumi. Noturīgie organiskie piesārņotāji
Secondary schoolPresentations15 -
Atkritumu šķirošana, transportēšana, izvietošana un deponēšana
Secondary schoolPresentations26 -
Cilvēks - atkritumi - vide
Secondary schoolPresentations13
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