Thoughts on the causes of tree mortality in Appalachia.
Neufeld
H S
HS
D015258:Acid Rain / Q000633:toxicity*; D000393:Air Pollutants / Q000633:toxicity; D001061:Appalachian Region; D017753:Ecosystem; D010126:Ozone / Q000633:toxicity; D014197:Trees
D015258:Acid Rain; D000393:Air Pollutants; D010126:Ozone