Biblio
Critical Levels for Ammonia. Atmospheric Ammonia. :375-382.
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2009. Potential for the Further Development and Application of Critical Levels to Assess the Environmental Impacts of Ammonia. Atmospheric Ammonia. :41-48.
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2009. Reassessment of Critical Levels for Atmospheric Ammonia. Atmospheric Ammonia. :15-40.
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2009.