Showing 1 - 2 results of 2 for search 'Pol´kin, S. I.'
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  1. 1
    Flotacija rud redkich metallov i olova /
    by Pol´kin, S. I.
    Published 1960
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  2. 2
    Obogaščeanije rud tantala i niobija.
    by Pol´kin, Stepan I.
    Published 1963
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