Columbia subject headings:
Komi-Permi︠a︡t︠s︡kiĭ avtonomnyĭ okrug (Russia)--History.
Komi-Permi︠a︡t︠s︡kiĭ avtonomnyĭ okrug (Russia)--Social life and customs.
Harvard subject headings:
Kama River Valley (Russia : Federation)
Princeton subject headings: