About: http://webisa.webdatacommons.org/45582795

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	By introducing a carefully controlled supply of air or oxygen through wells into a coal seam, the coal can be reacted in situ to produce mixtures of hydrogen, carbon monoxide, carbon dioxide, methane and other gases.
http://www.w3.org/ns/prov#wasQuotedFrom	greencarcongress.com