About: http://webisa.webdatacommons.org/355183363

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	In Iowa, the biggest problem is nitrate pollution in streams, rivers and water supplies.
http://www.w3.org/ns/prov#wasQuotedFrom	nationalgeographic.com