<http://webisa.webdatacommons.org/30513107>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/30513107>	<http://www.w3.org/ns/prov#value>	"However, one of the blocks in the upper course was held in place mainly by the pressure of the blocks on either side." .
<http://webisa.webdatacommons.org/prov/38065434>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/30513107> .
<http://webisa.webdatacommons.org/30513107>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<blogspot.com> .