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  1. 1
    Published 1970
    “...Informative report ;...”
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    Recognition of air pollution injury to vegetation: a pictorial atlas /
  2. 2
    Published 1985
    “...Information report E-X / Economics Branch, Canadian Forestry Service,...”
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    The Potential impact of the long range transport of air pollutants on Canadian forests : report of a scientific opinion survey /

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