Donor to Baltimore police surveillance program says privacy debate 'healthy'
The Baltimore Sun

Phosphorus

Tim Bell, a lead operator, takes a bag of sample from a fertilizer product, 'Crystal Green', at Hampton Roads Sanitation District's Nansemond Treatment Plant in Suffolk on Monday, March 12, 2012. Nutrient recovery process equipment recovers nutrients from wastewater and transform them into the fertilizer product.
Sangjib Min
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