About: http://webisa.webdatacommons.org/145268218

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	Heat the gypsum in a kiln to 600 to 900 degrees C in the presence of a reducing atmosphere such as hydrogen or carbon monoxide to produce calcium
http://www.w3.org/ns/prov#wasQuotedFrom	abovetopsecret.com