@misc{indiciae894b250ba745,
  title = {Potential mineral reserves},
  author = {V.E. McKelvey},
  year = {1974},
  doi = {10.1016/0301-4207(74)90016-6},
  url = {https://pubs.usgs.gov/publication/70009923},
  note = {Source identifier: 70009923}
}