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  1. 1
    Publicat 1985
    Nagpur : Government of India, Ministry of Steel, Mines & Coal, Indian Bureau of Mines, Mineral Statistics Division, -1985.
    v. ; 21 cm.
  2. 2
    Nagpur : The Bureau,
    v. : ill. ; 28-32 cm.
  3. 3
    Publicat 1982
    Nagpur : Mineral Economics Division, Indian Bureau of Mines, Ministry of Steel and Mines, -1982]
    v. : ill. : 25-30 cm.

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