Columbia subject headings:
Harvard subject headings:
Desert reclamation--Algeria.
Desert reclamation--Tunisia.
Hydraulic engineering--Algeria.
Hydraulic engineering--Tunisia.
Roudaire, François Élie, 1836-1885.
Sahara--History--19th century.
Princeton subject headings:
Desert reclamation--Algeria.
Desert reclamation--Tunisia.
Hydraulic engineering--Algeria.
Hydraulic engineering--Tunisia.
Roudaire, François Elie, 1836-1885.
Sahara--History--19th century.