<http://webisa.webdatacommons.org/prov/507909449>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/163377835> .
<http://webisa.webdatacommons.org/163377835>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/163377835>	<http://www.w3.org/ns/prov#value>	"In 1831, when Abraham Lincoln was a young man working on the river, his flatboat got stuck on a shoal, prompting him to invent a device to buoy stuck vessels." .
<http://webisa.webdatacommons.org/163377835>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<daedalus-books.com> .