About: http://webisa.webdatacommons.org/99283777

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	SILVER: Well, so the printing press - basically books were a luxury item before the printing press, where they cost the equivalent in today's dollars of about $25,000 to produce a manuscript.
http://www.w3.org/ns/prov#wasQuotedFrom	wwno.org