✦ LIBER ✦

Effectiveness of the use of high impact energies for breaking hard ledge rocks : 4F, 1T, 8R. Soviet Min. Sci. V9, N4, July–Aug. 1973, P373–376

✍ Scribed by B.V. Voitsekhovskii; L.A. Mitin; F.F. Voitsekhovskaya

No coin nor oath required. For personal study only.

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