4. MKU “Gorodskoy arkhiv” Magnitogorska (MKU “GA” Magnitogorska) [“City Archive” of Magnitogorsk]. (in Russian, unpublished).
5. Ob'edinennyj gosudarstvennyj arhiv Chelyabinskoj oblasti (OGA ChO) [Joint State Archive of Chelyabinsk Region]. (in Russian, unpublished).
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