<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54cb66bc1ba73_-_rare-earths-02-0113-mdn.jpg>
<http://www.popularmechanics.com/science/a12794/one-american-mine-versus-chinas-rare-earths-dominance-14977835/>