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      <marc:subfield code="a">"The Ecological Monitoring and Assessment Network is being organized to provide a national perspective on how Canadian ecosystems are being affected, to provide scientifically defensible rationales for control and management activities, to evaluate the effectiveness of control programs, and to identify new issues as they emerge. The Network is establishing links with similar programs in Europe, the United States and Mexico"--Executive Summary, page 3.</marc:subfield>
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