Africa Multiple Interactive Research Atlas (AMIRA)
https://journal.ru.ac.za/public/journals/2/cover_issue_112_en_US.jpg
Part of "AN ATTEMPT TO A KINYANKORE CLASSIFICATION OF MUSICAL INSTRUMENTS”, by Paul van Thiel, W.F., Review of Ethnology, No. 13, 1969, pp. 1-5, Institut fur Volkerkunde, Vienna University.