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<http://webisa.webdatacommons.org/15108212>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<unhcr.org> .
<http://webisa.webdatacommons.org/prov/12832720>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/15108212> .
<http://webisa.webdatacommons.org/15108212>	<http://www.w3.org/ns/prov#value>	"Engineers cover water sources or wells with concrete to protect them from parasites, bacteria and other things that could compromise their purity and cleanliness." .
<http://webisa.webdatacommons.org/prov/363427735>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/15108212> .