Our air
Subtitle: unfit for trees.
Contributors: United States. Forest Service.
Edition: Rev.
Series: NE-INF -- 14-72.
Publisher: U.S. Dept. of Agriculture, Forest Service
Published: 1972
Place of publication: [Washington, D.C.?]
Language: eng
Subjects: Trees -- Wounds and injuries.; Plants -- Effect of air pollution on.; Air -- Pollution -- Physiological effect.
Notes: Cover title.