About: http://webisa.webdatacommons.org/445274598

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	As far as I can tell, no further developments seemed necessary in the production of iron until about 1550 AD, when parts of Europe, in particular Britain, underwent what can be thought of as an energy crisis.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com