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ed. with additions and corrections). [Map]. Lincoln, NE: University of Nebraska Press (Smithsonian Institution). (Updated version of the map in Goddard 1996). .
*Gordon, Raymond G., Jr. (Ed.). (2005). Ethnologue: Languages of the world (15th ed.). Dallas, TX: SIL International. . (Online version: http://www.ethnologue.com).
*Greenberg, Joseph H. (1966). The Languages of Africa (2nd ed.). Bloomington: Indiana University.
*Mithun, Marianne. (1999). The languages of Native North America. Cambridge: Cambridge University Press. (hbk);

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