Columbia subject headings:
Agricultural laborers--Supply and demand--Congo (Democratic Republic)
Agricultural laborers--Supply and demand--Congo River Watershed.
Agriculture--Economic aspects--Congo (Democratic Republic)
Agriculture--Economic aspects--Congo River Watershed.
Harvard subject headings:
Agricultural laborers--Supply and demand--Congo (Democratic Republic)
Agricultural laborers--Supply and demand--Congo River Watershed.
Agriculture--Economic aspects--Congo (Democratic Republic)
Agriculture--Economic aspects--Congo River Watershed.
Princeton subject headings:
Agricultural laborers--Congo (Democratic Republic)--Supply and demand.
Agricultural laborers--Congo River Watershed--Supply and demand.
Agriculture--Economic aspects--Congo (Democratic Republic)
Agriculture--Economic aspects--Congo River Watershed.