Columbia subject headings:
Harvard subject headings:
Industrial productivity--Brazil.
Industrial relations--Brazil--History--20th century.
Industrial relations--Brazil--Pará (State)--History--20th century.
Labor market--Brazil--History--20th century.
Mass production--Brazil.
Mineração Rio do Norte S.A.--Employees--History.
Mineração Rio do Norte S.A.--Management--History.
Princeton subject headings:
Brazil--Economic conditions--20th century.
Capitalism--Brazil.
Industrial productivity--Brazil.
Industrial relations--Brazil--History--20th century.
Industrial relations--Brazil--Pará (State)--History--20th century.
Labor market--Brazil--History--20th century.
Mass production--Brazil.
Mineração Rio do Norte S.A.--Employees--History.
Mineração Rio do Norte S.A.--Management--History.