Mescalero-Chiricahua language
Mescalero-Chiricahua (also known as Chiricahua Apache) is a Southern Athabaskan language spoken by the Chiricahua and Mescalero people in Chihuahua and Sonora, México and in Oklahoma and New Mexico. It is related to Navajo and Western Apache and has been described in great detail by the anthropological linguist Harry Hoijer (1904–1976), especially in Hoijer & Opler (1938) and Hoijer (1946).
Source: Wikipedia — Mescalero-Chiricahua language (CC BY-SA 4.0)