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1Published 1973Vorkuta : [s.n.], 1973.108 p. ; 20 cm.Subjects: “...Coal mines and mining Equipment and supplies Congresses....”
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2Published 1984Moskva : In-t gornogo dela im. A.A. Skochinskogo, 1984.63 p. ; 20 cm.Subjects: “...Coal mines and mining Soviet Union Congresses....”