| http://www.w3.org/ns/prov#value | - Howard???s research also suggests that some of that underground construction debris may actually be having a beneficial effect in certain polluted soils.Detroit???s industrial heritage has left its soils???like those of many cities???contaminated with lead and other heavy metals, from coal burning, smelting, lead paint, and leaded gasoline.Although lead paint and leaded gas have been discontinued
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