About: http://webisa.webdatacommons.org/178091943

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	Also an object, such as a stone, that defines the sides of the trail, helping to keep users in the center of the tread. (Keystone, Gargoyle, Corral Rock, Corralling, Dragon???s Tooth, Shepherd) Return
http://www.w3.org/ns/prov#wasQuotedFrom	americantrails.org