@misc{indiciae0854f087339f,
  title = {Value of domestic production of minerals from various classes of rocks},
  author = {Vincent E. McKelvey and J.E. Crawford and D.F. Davidson and Robert Leland Boardman},
  year = {1950},
  doi = {10.2113/gsecongeo.45.5.470},
  url = {https://pubs.usgs.gov/publication/70215318},
  note = {Source identifier: 70215318}
}