<http://webisa.webdatacommons.org/141927705>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<washington.edu> .
<http://webisa.webdatacommons.org/141927705>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/141927705>	<http://www.w3.org/ns/prov#value>	"limitations have been due mainly to three causes:" .
<http://webisa.webdatacommons.org/prov/259982690>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/141927705> .