Invasive species :
clearer focus and greater commitment needed to effectively manage the problem /
United States General Accounting Office.
|Corporate Author:||United States.|
Washington, D.C. : General Accounting Office, 
Discharge of ballast water
Discharge of ballast water /
Discharge of ballast water / United States /
Nonindigenous pests > Nonindigenous pests / United States > Nonindigenous pests / United States / Management.
Plant introduction > Plant introduction / United States > Plant introduction / United States / Management.
Animal introduction > Animal introduction / United States > Animal introduction / United States / Management.
Biological invasions > Biological invasions / United States > Biological invasions / United States / Management.
Available on the World Wide Web.
ii, 96 p. :
ill., maps ;
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||University of Illinois at Urbana-Champaign|