About: http://webisa.webdatacommons.org/4822158

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	Such known methods may include digging a trench around the desired perimeter of the subterraneal volume and placing a mixture including bentonite to further support the walls during the excavation process.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com