About: http://webisa.webdatacommons.org/375456713

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	These isotopes, heavier versions of common elements including calcium, iron and nitrogen, can then be easily traced using special instrumentation.
http://www.w3.org/ns/prov#wasQuotedFrom	usda.gov