About: http://webisa.webdatacommons.org/263349831

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	, coal miners would lower a cage with a tiny canary into a mine to determine if the levels of methane, carbon dioxide or other noxious gases were present.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com