<http://schema.org/description>
"This graphic tracks the end of June Palmer Drought Severity Index (PDSI) readings for 2012 and 2013 along with the net change between the two years."^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.dtnpf.com/agriculture/web/ag/perspectives/blogs/fundamentally-speaking/blog-post/2013/07/18/improved-palmer-drought-index>