Disambiguation evidence for Keweenaw copper mining district via surface form
"Copper Country mining era"
Triples (1)
Triples where some other subject referred to this entity
as "Copper Country mining era".
Eagle Harbor, Michigan
→
hasHistoricPeriodOfGrowth
→
"Copper Country mining era"
ⓘ
↳ resolves to Keweenaw copper mining district