About: http://webisa.webdatacommons.org/80312068

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	If u negate C i.e. there ARE sources available that are neither considered best nor neglected by the historians, then the argument falls apart because then we can categorize these other repositories as these particular sources.
http://www.w3.org/ns/prov#wasQuotedFrom	gmatclub.com