About: http://webisa.webdatacommons.org/82424160

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	Portland cement is a particular sort of cement, patented in 1824 and named for its similarity to building stone quarried from the Isle of Portland.
http://www.w3.org/ns/prov#wasQuotedFrom	greengabbro.net