About: http://webisa.webdatacommons.org/166550279

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 cavern varies from 5 to 30 feet high, and the deepest point is approximately 70 feet below the surface (Forney, 1977).
http://www.w3.org/ns/prov#wasQuotedFrom	nd.gov