<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x426/54cb1b586eaf4_-_bho-airship-08-0913-de-77017421.jpg>
<http://www.popularmechanics.com/flight/g1281/a-brief-history-of-the-airship/>