Columbia subject headings:
Foundries--Peru.
Foundry workers--Labor unions--Peru.
Foundry workers--Peru--Economic conditions.
Foundry workers--Peru--Social conditions.
Fundición Callao.
Metal-workers--Labor unions--Peru.
Metal-workers--Peru--Social conditions.
Harvard subject headings:
Princeton subject headings:
Foundries--Peru.
Foundry workers--Labor unions--Peru.
Foundry workers--Peru--Economic conditions.
Foundry workers--Peru--Social conditions.
Fundición Callao.
Metal-workers--Labor unions--Peru.
Metal-workers--Peru--Social conditions.