Don't help hitchhikers
By: prepared by Plant Quarantine Division, Agricultural Research Service, U.S. Dept. of Agriculture
Edition: Rev. March 1964
Series: U.S. Agricultural Research Service, ARS 82 -- 3; ARS 82 -- 3.
Publisher: U.S. Dept. of Agriculture, Agricultural Research Service
Published: 1964
Place of publication: Hyattsville, Md
Language: eng
Subjects: Plant quarantine; Plants; Diseases and pests; Control