Columbia subject headings:
Environmental protection--Morocco--Rif.
Mountain ecology--Morocco--Rif.
Rif (Morocco)--Environmental conditions.
Harvard subject headings:
Environmental protection--Morocco--Rif.
Mountain ecology--Morocco--Rif.
Rif (Morocco)--Environmental conditions.
Princeton subject headings:
Environmental protection--Morocco--Rif.
Mountain ecology--Morocco--Rif.
Rif (Morocco)--Environmental conditions.