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<http://webisa.webdatacommons.org/prov/434982519>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/251880964> .
<http://webisa.webdatacommons.org/251880964>	<http://www.w3.org/ns/prov#value>	"The most common soft rock is coal, but so are common salt, potash, bauxite and other minerals." .
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<http://webisa.webdatacommons.org/251880964>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<issuu.com> .