With the agreement of local authorities and the scientific support of Jakob Fahr, a survey of a period of 5 November 2010 to March 2011, in three countries in West Africa was conducted.
Kwa mkataba wa serikali za mitaa na msaada wa kisayansi wa Jakob Fahr, utafiti wa kipindi cha 5 Moise Novemba 2010 hadi Machi 2011, katika nchi tatu za Afrika Magharibi ulifanyika.