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Bīstamo un mazbīstamo atkritumu izcel...
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Bīstamo un mazbīstamo atkritumu izcelsme un iedarbība pazemes ūdeņos
Secondary schoolSummaries, Notes9 -
Organiskās vielas
Secondary schoolSummaries, Notes3 -
Organiskās vielas manā mājā
Secondary schoolSummaries, Notes7
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