<https://sewisc.org/resources/newsletters/fall-2013-volume-3-number-3/316-where-ecology-meets-economy>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sewisc.org/resources/newsletters/fall-2013-volume-3-number-3/316-where-ecology-meets-economy>