About: http://webisa.webdatacommons.org/440131861

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	CH: The most difficult sections of the book to write were those concerned with science: most especially physics and biology.
http://www.w3.org/ns/prov#wasQuotedFrom	nationalbook.org