Columbia subject headings:
Agriculture--Economic aspects--Brazil--Alagoas--History.
Alagoas (Brazil)--Social conditions.
Sugarcane industry--Brazil--Alagoas--History.
Harvard subject headings:
Agriculture--Economic aspects--Brazil--Alagoas (State)--History
Alagoas (Brazil)--Social conditions.
Sugarcane industry--Brazil--Alagoas--History.
Princeton subject headings:
Agriculture--Economic aspects--Brazil--Alagoas--History.
Alagoas (Brazil)--Social conditions.
Sugarcane industry--Brazil--Alagoas--History.