Air pollution in the Columbia-Willamette region
Subtitle: what is it, what's being done about it, what you can do to help restore purity.
Contributors: Columbia-Willamette Air Pollution Authority.
Publisher: The Authority
Published: 1970
Place of publication: [Portland, Or
Language: eng
Number of pages: 18
Subjects: Air -- Pollution -- Oregon -- Portland Metropolitan Area.
Notes: Cover title.

"April 1970."