<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54caecf0d9905_-_oil-boom-02-0612-de.jpg>
<http://www.popularmechanics.com/science/energy/a7724/oil-boom-north-dakota-is-the-next-hub-of-us-energy-9660512/>