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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 -
Elementu aprite dabā
Secondary schoolSummaries, Notes5 -
Enerģija dabā un tehnikā
Secondary schoolSummaries, Notes2
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