<https://www.gettingsmart.com/2013/07/08/edshelf-celebrates-learning-about-the-united-states/#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.gettingsmart.com/2013/07/08/edshelf-celebrates-learning-about-the-united-states/>