About: http://webisa.webdatacommons.org/88951118

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	Block 17 is preferably fabricated of a material such as aluminum, and its upper surface 17a is polished to serve as a reflecting surface.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com