The Upper Kuskokwim language (also called Kolchan or Goltsan) is an Athabaskan language of the Na-Dené language family. It is spoken in the Upper Kuskokwim River villages of Nikolai, Telida, and McGrath, Alaska. About 40 of a total of 160 Upper Kuskokwim people still speak the language. A practical orthography of the language was established by Raymond Collins, who in 1964 began linguistic work at Nikolai.
Gordon, Raymond G., Jr. (Ed.). (2005). Ethnologue: Languages of the world (15th ed.). Dallas, TX: SIL International. ISBN 1-55671-159-X. (Online version: http://www.ethnologue.com).