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Zapadno-Sibirskai︠a︡ nizmennostʹ : ocherk prirody
Abramovich, David Iosifovich, (1963)
Neftʹ i gaz Komi ASSR : Sbornik dokumentov i materialov
Zacharov, Valerij Dmitrievič, (1979)
Komi ASSR administrativno-territorialʹnoe delenie : na 1 ijulja 1968 godu
(1968)