<https://sdbullion.com/blog/over-50-years-of-eastern-aggregated-silver-price-is-226-68-oz>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sdbullion.com/blog/over-50-years-of-eastern-aggregated-silver-price-is-226-68-oz>