Exploration in some major coalfields of India.

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Item Link Original Source
Limited (search only)   v.1 University of Michigan
Limited (search only)   v. 1 University of California
Limited (search only)   v.2 University of Michigan
Limited (search only)   v. 2 University of California
Limited (search only)   no.35(1977) University of Illinois at Urbana-Champaign