About: http://webisa.webdatacommons.org/290217477

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	From one vantage point, books are the quintessential secondary source: scholars use primary source materials such as letters and diaries to write books, which are in turn secondary sources.
http://www.w3.org/ns/prov#wasQuotedFrom	yale.edu