Uppsala: Almqvist & Wiksell, 1972 in-4, 176 pages, carte. Bibliographie Broché. (Studia ethnographica Upsaliensia XXXV) "An ethnological study of the socio-economic situation and ecology of African waterfolk. The study is a comparative one, based on printed sources. the author selected one geographical area, the Niger river, which, in his opinion, offers representative examples of African water economies"
Ecology and symbiosis: Niger water folk. (Uppsala: Almqvist & Wiksell, 1972) [M.C.: Afrique noire, ethnologie, fleuve Niger, sociétés de pêcheurs]