<http://webisa.webdatacommons.org/170441667>	<http://www.w3.org/ns/prov#value>	"Their works are a major source of the environmental movement's strength." .
<http://webisa.webdatacommons.org/prov/310727099>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/170441667> .
<http://webisa.webdatacommons.org/170441667>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/170441667>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<nrdc.org> .