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Additional information
“Gipromashobogashchenie,” Moscow. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 129–131, January–February, 1971.
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Pyatkovskii, P.I. Calculation of the hardness coefficient of rocks. Soviet Mining Science 7, 109–110 (1971). https://doi.org/10.1007/BF02501233
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DOI: https://doi.org/10.1007/BF02501233