Columbia subject headings:
Carbon dioxide--Environmental aspects.
Carbon dioxide--Environmental testing.
Carbon dioxide--Physiological effect.
Plants--Effect of atmospheric carbon dioxide on.
Harvard subject headings:
Carbon dioxide--Environmental aspects.
Carbon dioxide--Environmental testing.
Carbon dioxide--Physiological effect
Plants--Effect of atmospheric carbon dioxide on
Princeton subject headings:
Carbon dioxide--Environmental aspects.
Carbon dioxide--Environmental testing.
Carbon dioxide--Physiological effect.
Plants--Effect of atmospheric carbon dioxide on.