<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://clv.h-cdn.co/assets/cm/15/09/320x426/54f0d9e7afe0d_-_clx-collecting-presidents-book-cover-1112-lgn-19033893.jpg>
<http://www.countryliving.com/shopping/antiques/g1373/presidential-memorabilia/>