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1Published 1973Vorkuta : [s.n.], 1973.100 p. ; 20 cm.Subjects: “...Coal mines and mining Congresses....”
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2Published 1973Vorkuta : [s.n.], 1973.108 p. ; 20 cm.Subjects: “...Coal mines and mining Equipment and supplies Congresses....”
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3Published 1973Vorkuta : [s.n.], 1973.84 p. ; 20 cm.Subjects: “...Coal mines and mining Russia (Federation) Pechora Basin....”
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4Published 1956Syktyvkar : Komi knizhnoe izd-vo, 1956.97 p., [3] leaves of folded plates : ill. ; 23 cm.Subjects: “...Coal mines and mining Labor productivity Russia (Federation) Pechora Basin....”