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| Water withdrawal protections | Jun 6 2004 |
| West Valley nuclear wastes | Jun 6 2004 |
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| Wetland Protection in Canada | May 5 1991 |
| Wetland Protection in United States | May 5 1991 |
| Zero Discharge and Pollution Prevention | May 5 1991 |
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| Wetlands Protection | May 19 1985 |
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| Winter Navigation | May 8 1988 |
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| Wolfe and North Fox Islands | May 3 1992 |
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| Year After Great Lakes Charter | May 18 1986 |
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| YUCCA MOUNTAIN RESOLUTION | Jun 9 2002 |
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| Zero discharge of biological pollution in the Great Lakes from ballast water by 2011 | Jun 9 2005 |
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| Zero Discharge Task Force | May 6 1990 |