Assertion: early coin | /r/CapableOf | span the period
Facets:
value: to 1843
type: TEMPORAL
Source sentences:
text: The isotope composition of early coins spanning the period 1828 to 1843 reflects the copper from Cornish ores from England, while coins after 1850 reflect the Keweenaw Peninsula, Michigan ores, a finding consistent with historical records.