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Translated from Ogneupory, No. 10, pp. 19–21, October, 1969.
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Fedin, I.A., Der'enev, L.S., Popov, V.M. et al. Experience with pyrodrilling of quartzites. Refractories 10, 618–619 (1969). https://doi.org/10.1007/BF01295353
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DOI: https://doi.org/10.1007/BF01295353