@misc{indiciae3b06bf354d79,
  title = {Silver in veins of hypogene manganese oxides},
  author = {D. F. Hewett},
  year = {1968},
  doi = {10.3133/cir553},
  url = {https://pubs.usgs.gov/publication/cir553},
  note = {Source identifier: cir553}
}