About: http://webisa.webdatacommons.org/148975067

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	Slate roofing is made of natural stone quarried from the Northeast United States, Canada, Virginia, Wales, Spain, China, South Africa, and other parts of the world.
http://www.w3.org/ns/prov#wasQuotedFrom	guardianexteriors.com