About: http://webisa.webdatacommons.org/81589630

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	Answer: There is an upgrade price from the electronic version to the CD-ROM which is much lower, and purchase (or pre-order) of the CD-ROM includes registration of the electronic version.
http://www.w3.org/ns/prov#wasQuotedFrom	gameboomers.com