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PlainsIndianSignLanguage is a ManualHumanLanguage of the UnitedStates. SIL code: PSD. ISO 639-2: sgn. Population: No estimate available. Region: Great Plains of the USA and Canada. Also spoken in Canada. Alternate names: PLAINS SIGN LANGUAGE. Comments: Some variation by ethnic group and region. Formerly used between nations in hunting, trade, by deaf people, and at every level of social interaction, and with non-Indians. Today used within nations in storytelling, rituals, legends, prayers, and by deaf people. Arose when horses were introduced from the south by the Spanish and guns from the east by the French. Second language only.(extract from http://www.ethnologue.com/)
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