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Air qual
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Titles
Air pollution's toll on forests and crops /
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(Language materials, printed)
Subjects
Crops- Effect of air pollution on- Europe.
Trees- Losses.
Crop losses.
Crops- Wounds and injuries.
Trees- Effect of air pollution on- Europe.
Trees- Wounds and injuries.
Crops- Effect of air pollution on- United States.
Air qual
Forest declines.
Trees- Effect of air pollution on- United States.
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