Columbia subject headings:
Farm mechanization--Sudan--Case studies.
Human geography--Sudan--Case studies.
Labor mobility--Sudan--Case studies.
Residential mobility--Sudan--Case studies.
Harvard subject headings:
Farm mechanization--Sudan--Case studies.
Human geography--Sudan--Case studies.
Labor mobility--Sudan--Case studies.
Residential mobility--Sudan--Case studies.
Princeton subject headings:
Farm mechanization--Developing countries.
Farm mechanization--Sudan.
Migration, Internal--Developing countries.
Migration, Internal--Sudan.
Rural-urban migration--Developing countries.
Rural-urban migration--Sudan.
Skilled labor--Developing countries.
Skilled labor--Sudan.