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1Published 2003Subjects: “...Environmental indicators North America....”
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2Published 2004Subjects: “...Environmental indicators North America....”
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3Published 1999Subjects: “...Environmental indicators North America....”
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4Published 2000Subjects: “...Environmental indicators North America....”
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5Published 2004Subjects: “...Environmental indicators North America....”
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6Published 2003Subjects: “...Environmental indicators North America....”
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7Published 2007Subjects: “...Environmental indicators North America....”
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