Columbia subject headings:
Harvard subject headings:
Agricultural innovations--Brazil--Paraná (State).
Agriculture--Economic aspects--Brazil--Paraná (State).
Paraná (Brazil : State)--Economic conditions.
Rural development--Brazil--Paraná (State).
Princeton subject headings:
Agricultural innovations--Brazil--Paraná (State).
Agriculture--Economic aspects--Brazil--Paraná (State).
Paraná (Brazil : State)--Economic conditions.
Rural development--Brazil--Paraná (State).