Washington Post | Study: Cleaner Potomac boosts underwater grasses Baltimore Sun (blog) Analyzing 18 years of data, US and British scientists found that as nutrient levels in the river declined, the extent of submerged aquatic vegetation, ... Potomac River cleanest in decades, scientists say Potomac River responding to cleanup Potomac River Gains New Life |
Sunday, September 12, 2010
Study: Cleaner Potomac boosts underwater grasses - Baltimore Sun (blog)
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