Columbia subject headings:
Agriculture--Economic aspects--Medjerda River Valley (Algeria and Tunisia)
Irrigation--Medjerda River Valley (Algeria and Tunisia)
Reclamation of land--Medjerda River Valley (Algeria and Tunisia)
Harvard subject headings:
Agriculture--Economic aspects--Medjerda River Valley (Algeria and Tunisia)
Irrigation--Medjerda River Valley (Algeria and Tunisia)
Reclamation of land--Medjerda River Valley (Algeria and Tunisia)
Princeton subject headings:
Agriculture--Economic aspects--Medjerda River Valley (Algeria and Tunisia).
Irrigation--Medjerda River Valley (Algeria and Tunisia).
Reclamation of land--Medjerda River Valley (Algeria and Tunisia).