<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54caad3f4da8c_-_mining-robot-1-sm.jpg>
<http://www.popularmechanics.com/science/energy/a6049/real-price-of-coal-mining-investigative-report/>