@misc{indiciaec1c5a18b0d14,
  title = {Gold contents of 766 A-horizon soil samples from the Vermilion District, northeastern Minnesota},
  author = {J. B. McHugh and H. V. Alminas and E.C. Perry},
  year = {1990},
  doi = {10.3133/ofr9086},
  url = {https://pubs.usgs.gov/publication/ofr9086},
  note = {Source identifier: ofr9086}
}