About: http://webisa.webdatacommons.org/66860722

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	id, London, GB, cf. therein especially the chapter Mud Testing--Tools and Techniques" and Oil Mud Technlogy, which reference book is freely available to the interested artisans.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es