Assertion: anthracite | /r/CapableOf | sell for 11 per ton
Facets:
value: in 1830
type: TEMPORAL
Source sentences:
text: In 1830 anthracite coal was selling for $11 per ton, in 1840 it was $7 per ton, and by 1860 it was $5.50 a ton in NYC, while total production was increasing (Adams, “US Coal Industry”).