<http://webisa.webdatacommons.org/319686660>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<usgs.gov> .
<http://webisa.webdatacommons.org/prov/94709224>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/319686660> .
<http://webisa.webdatacommons.org/319686660>	<http://www.w3.org/ns/prov#value>	"USGS studies also indicate that atmospheric deposition appears to be a substantial source of nitrogen and some metals, such as chromium and zinc, to surface waters." .
<http://webisa.webdatacommons.org/prov/360924518>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/319686660> .
<http://webisa.webdatacommons.org/319686660>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .