Singh, T. N., & Dhar, B. B. (1993). Thick seam mining: Problems and issues. Rotterdam: Ashgate Publishing Co..
Παραπομπή Chicago StyleSingh, T. N., and Bharat B. Dhar. Thick Seam Mining: Problems and Issues. Rotterdam: Ashgate Publishing Co., 1993.
Παραπομπή MLASingh, T. N., and Bharat B. Dhar. Thick Seam Mining: Problems and Issues. Rotterdam: Ashgate Publishing Co., 1993.
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