Columbia subject headings:
Agriculture--Economic aspects--Brazil.
Family farms--Brazil--Paraná (State)--Case studies.
Family farms--Brazil.
Soybean industry--Brazil--Paraná (State)--Case studies.
Harvard subject headings:
Agriculture--Economic aspects--Brazil
Family farms--Brazil
Family farms--Brazil--Paraná (State)--Case studies.
Soybean industry--Brazil--Paraná (State)--Case studies.
Princeton subject headings:
Agriculture--Economic aspects--Brazil--Paraná (State).