Etymologically
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SRNG 1965–

Filin, F. P.; Sorokoletov, F. P.; Myznikov, S. A. (eds.) (1965–), Slovar' russkix narodnyx govorov [Словарь русских народных говоров], vols. 1–51, Moskva / Leningrad / Sankt-Peterburg: Nauka

Footnotes show it as “SRNG”.

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