Columbia subject headings:
Kama River Valley (Russia)--Languages.
Turkic languages--Foreign words and phrases.
Turkic languages--Lexicology.
Udmurt language--Foreign words and phrases.
Udmurt language--Lexicology.
Volga River Region (Russia)--Languages.
Harvard subject headings:
Languages in contact--Russia (Federation)--Kama River Region.
Turkic languages--Foreign words and phrases--Udmurt
Udmurt language--Foreign words and phrases--Turkic
Princeton subject headings: