<http://webisa.webdatacommons.org/149180418>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<columbia.edu> .
<http://webisa.webdatacommons.org/149180418>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/95333942>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/149180418> .
<http://webisa.webdatacommons.org/149180418>	<http://www.w3.org/ns/prov#value>	"In each case, we examine the kinds of errors that occur." .