About: http://webisa.webdatacommons.org/281146984

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	These consider the physical properties of the sand, such as grain size, sphericity and roundness, crush resistance and other factors.
http://www.w3.org/ns/prov#wasQuotedFrom	wellservicingmagazine.com