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<http://webisa.webdatacommons.org/440131861>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/440131861>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<nationalbook.org> .
<http://webisa.webdatacommons.org/440131861>	<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://webisa.webdatacommons.org/prov/432584856>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/440131861> .