@misc{indiciaedb838ec1c31a,
  title = {Observations on the pyrite deposits of the huelva district, Spain, and their relation to volcanism},
  author = {A.R. Kinkel},
  year = {1962},
  doi = {10.2113/gsecongeo.57.7.1071},
  url = {https://pubs.usgs.gov/publication/70220655},
  note = {Source identifier: 70220655}
}