About: http://webisa.webdatacommons.org/427174638

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	An isotopic composition of nitrate (delta nitrogen???15) greater than 8 per mil in many of the samples indicated there was a contribution of nitrate with a biogenic (human and or animal waste, or both) origin.
http://www.w3.org/ns/prov#wasQuotedFrom	usgs.gov