Columbia subject headings:
Harvard subject headings:
Air--Pollution--Congresses
Contaminated forests--Congresses.
Forest ecology--Congresses
Forests and forestry--Congresses
Trees--Climatic factors--Congresses.
Trees--Effect of acid deposition on--Congresses.
Trees--Effect of acid precipitation on--Congresses.
Trees--Effect of air pollution on--Congresses.
Trees--Effect of global warming on--Congresses.
Trees--Effect of ozone on--Congresses.
Trees--Physiology--Congresses.
Princeton subject headings:
Air--Pollution--Congresses.
Contaminated forests--Congresses.
Forest ecology--Congresses.
Forests and forestry--Congresses.
Trees--Climatic factors--Congresses.
Trees--Effect of acid deposition on--Congresses.
Trees--Effect of acid precipitation on--Congresses.
Trees--Effect of air pollution on--Congresses.
Trees--Effect of global warming on--Congresses.
Trees--Effect of ozone on--Congresses.
Trees--Physiology--Congresses.