About: http://webisa.webdatacommons.org/456489803

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	Anthracite coal in particular was a preferred fuel source after a way of efficiently burning it was perfected.
http://www.w3.org/ns/prov#wasQuotedFrom	treasurenet.com