A large number of languages known only from brief mentions are thought to have been Uto-Aztecan languages, but went extinct without being documented. The following list is based on Campbell (1997:133–135).San Nicolás (Nicoleño): spoken in California, thought to be a Takic language.Giamina/Omomil: Kroeber (1907) and Lamb (1964) believe Giamina may constitute a separate branch of Northern Uto-Aztecan, although Miller (1983) is uncertain about this.
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