About: http://webisa.webdatacommons.org/373435317

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	Textbooks are especially valuable because of the questions and problem sets they contain.
http://www.w3.org/ns/prov#wasQuotedFrom	loc.gov