Quarantines prevent the spread of plant pests
Contributors: United States. Agricultural Research Service
Edition: Rev.
Series: PA -- 654; Program aid (United States. Department of Agriculture) -- no. 654.
Publisher: U.S. Dept. of Agriculture
Published: 1969
Place of publication: [Washington, D.C.]
Language: eng
Subjects: Agricultural pests; Control; Plant quarantine
Notes: Cover title.

"Slightly revised May 1969."--P. [8].