@misc{indiciaed2236aa1785e,
  title = {Mineral resource perspectives 1975},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1975},
  doi = {10.3133/pp940},
  url = {https://pubs.usgs.gov/publication/pp940},
  note = {Source identifier: pp940}
}