Assertion: iron | /r/HasProperty | obtained for example
Facets:
value: during the american revolution
type: TEMPORAL
value: from widely available goethite
type: OTHER
value: from bog ore
type: LOCATION
value: during the napoleonic wars
type: TEMPORAL
Source sentences:
text: Prior to the industrial revolution, most iron was obtained from widely available goethite or bog ore, for example during the American Revolution and the Napoleonic Wars.