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Additional information
Translated from Ogneupory, No. 11, pp. 58–61, November, 1978.
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Kozlov, A.G., Berezhnoi, Y.I. Reclamation of soil destroyed by mine working in the Bulgarian People's Republic. Refractories 19, 728–730 (1978). https://doi.org/10.1007/BF01285706
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DOI: https://doi.org/10.1007/BF01285706