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<http://webisa.webdatacommons.org/prov/217584864>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/442556123> .
<http://webisa.webdatacommons.org/442556123>	<http://www.w3.org/ns/prov#value>	"DEFINITION A chalkboard or blackboard is a reusable writing surface on which text or drawings are made with chalk or other erasable markers.Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone." .
<http://webisa.webdatacommons.org/442556123>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<blogspot.com> .