About: http://webisa.webdatacommons.org/98604664

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 upper layer or branch is a very compact, black, brittle and brilliant coal, eighteen to twenty-two inches in thickness.
http://www.w3.org/ns/prov#wasQuotedFrom	illinoisancestors.org