About: http://webisa.webdatacommons.org/42916571

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	As far as I know, no such studies have been made about the p-book/ebook market, but again there are empirical observations that show a similar trend (see the Baen case, or authors such as Doctorow).
http://www.w3.org/ns/prov#wasQuotedFrom	mobileread.com