PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • In organic chemistry, the term nitrates refers to the esters of nitric acid and various alcohols. ??? ???Nitrate - New World Encyclopedia???, Nitrogen is a major constituent of the earth's atmosphere and occurs in many different gaseous forms such as elemental nitrogen, nitrate and ammonia.
http://www.w3.org/ns/prov#wasQuotedFrom
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