@misc{indiciae4e22227f21aa,
  title = {Physical factors that could restrict mineral supply},
  author = {John H. DeYoung and Donald A. Singer},
  year = {1981},
  doi = {10.5382/av75.29},
  url = {https://pubs.usgs.gov/publication/70197262},
  note = {Source identifier: 70197262}
}