<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x426/54cb1b5810b07_-_bho-airship-07-0913-de-7627974.jpg>
<http://www.popularmechanics.com/flight/g1281/a-brief-history-of-the-airship/>