<http://webisa.webdatacommons.org/prov/301266400>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/190996457> .
<http://webisa.webdatacommons.org/190996457>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<slideshare.net> .
<http://webisa.webdatacommons.org/190996457>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/190996457>	<http://www.w3.org/ns/prov#value>	"Trenches must be excavated in such a manner as to insure that the sides will be stable under all working conditions." .