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Publisher: Research Triangle Park, NC: U.S. Environmental Protection Agency, Office of Research and Development Publication date: 2000 Subjects: Environmental monitoring -- United States Ecological risk assessment -- United States Environmental indicators -- United States Notes: This is an OCR reprint. There may be numerous typos or missing text. There are no illustrations or indexes. When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. You can also preview the book there.