Donno SO is a Dogon language. Dogon is a group of languages in the Niger-Congo language family (roughly analogous to the Romance languages in Indo-European), spoken in Mali and Burkina Faso. The affiliation of Dogon within Niger-Congo has not been determined with certainty, but it seems to be marginally related to Gur.
The dictionary was compiled by Marcel Kervran, a member of the Pères Blancs, who lived in the town of Bandiagara, Mali for about 30 years. This dictionary has over 7000 head words. A second expanded edition was published in 1993. The dictionary (partially) represents the varieties of Donno SO spoken in and around Bandiagara.