Columbia subject headings:
Cornish--United States.
Miners--United States.
Mines and mineral resources--United States.
Harvard subject headings:
Cornish in the United States.
Cornish--United States.
Miners--United States.
Mines and mineral resources--United States
Princeton subject headings:
Cornish in the United States.
Miners--United States.
Mines and mineral resources--United States.