@misc{indiciae04ba4c46ac55,
  title = {Rank enhancement of Permian Barakar and Raniganj coal measures in the western part of the Sohagpur coalfield, Madhya Pradesh, India},
  author = {Peter D. Warwick and Robert C. Milici and Abhijit Mukhopadhyay and Siri Adhikari},
  year = {1999},
  url = {https://pubs.usgs.gov/publication/70195479},
  note = {Source identifier: 70195479}
}