About: http://webisa.webdatacommons.org/309328764

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	While the biggest source of nitrates in the Mississippi River network are industrial fertilizers, nitrates also come from animal manure, urban areas, wastewater treatment and other sources, according to USGS.
http://www.w3.org/ns/prov#wasQuotedFrom	phys.org