Columbia subject headings:
Miners--Family relationships--Peru--Statistics.
Miners--Peru--Statistics.
Peru--Occupations--Statistics.
Harvard subject headings:
Miners--Peru--Family relationships--Statistics.
Miners--Peru--Statistics.
Occupations--Peru--Statistics.
Princeton subject headings:
Miners--Peru--Family relationships--Statistics.
Miners--Peru--Statistics.
Occupations--Peru--Statistics.