About: http://webisa.webdatacommons.org/228575933

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	It is to be noted that the gas may primarily comprise hydrocarbon vapors and may additionally include air, nitrogen, carbon dioxide, hydrogen sulfide and other gases.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca