About: http://webisa.webdatacommons.org/85430308

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	The skies above such major cities as Chicago and Pittsburgh were dark with smoke from steel smelters, heavy industrial plants and burning coal.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com