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Interaction between GKK-4 mechanized supports and the rocks surrounding a thick steeply dipping seam : 2F, 1T, 4R. SOVIET MIN. SCI. V9, N2, MAR–APR. 1973, P224

✍ Scribed by A.K. Kovrizhin; S.P. Yakovlev; V.P. Firsov

No coin nor oath required. For personal study only.

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