About: http://webisa.webdatacommons.org/346640217

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	Also, with technology books, magazines and other materials, the easy answer is that since the materials become technically obsolete fairly quickly, older versions can just be discarded.
http://www.w3.org/ns/prov#wasQuotedFrom	scienceblogs.com