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| Utgitt
| [Reston, VA] : Denver, CO : U.S. Department of the Interior, U.S. Geological Survey, For sale by U.S. Geological Survey, Branch of Information Services , 2003
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| Omfang
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| Opplysninger
| "National Water Quality Assessment Program.". - Includes bibliographical references (p. 115-123).
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| Emner
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| ISBN
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