Safe ballast discharge.
Contributors: Washington (State). Dept. of Ecology.
Edition: Rev. 1/2002 [i.e. 1/2001].
Series: Focus -- no. 99-1309.; Focus (Washington (State). Dept. of Ecology) -- no. 99-1309.
Publisher: Washington State Dept. of Ecology
Published: 2001
Place of publication: Olympia, Wash
Language: eng
Subjects: Discharge of ballast water -- Environmental aspects -- Washington (State)
Notes: Caption title.

"January 2001."

Includes bibliographical reference.