Columbia subject headings:
Brazil, Northeast--Economic conditions.
Brazil, Northeast--Social conditions.
Brazil. Superintendência do Desenvolvimento do Nordeste.
Harvard subject headings:
Brazil, Northeast--Economic conditions.
Brazil, Northeast--Social conditions.
Brazil. Superintendência do Desenvolvimento do Nordeste.
Princeton subject headings:
Brazil, Northeast--Economic conditions.
Brazil, Northeast--Social conditions.
Brazil. Superintendência do Desenvolvimento do Nordeste