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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 -
Dabisko ogļūdeņražu ieguves avoti un veidi
Secondary schoolSummaries, Notes4 -
Materiālu apstrādes veidi
Secondary schoolSummaries, Notes6
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