<https://www.bladesmithsforum.com/index.php?/topic/41980-1075-heat-treatment/#comment-419096>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.bladesmithsforum.com/index.php?/topic/41980-1075-heat-treatment/&tab=comments#comment-419281>