Trees for polluted air
Series: Miscellaneous publication / United States Department of Agriculture -- no.      1230
Publisher: U.S. Dept. of Agriculture, Forest Service
Published: 1973
Place of publication: Washington, D.C
Language: eng
Number of pages: 12
Subjects: Pollution; Trees in cities; Plants; Effect of air pollution on
Other titles: Our air.
Notes: Cover title.

"This leaflet was originally issued by the USDA Forest Service, Northeastern Forest Experiment Stations, Upper Darby, Pa., as Our air : unfit for trees, in August 1972."