@misc{indiciae03399462dcc7,
  title = {Geologic studies of mercury by the U.S. Geological Survey},
  author = {John E. Gray},
  year = {2003},
  doi = {10.3133/cir1248},
  url = {https://pubs.usgs.gov/publication/cir1248},
  note = {Source identifier: cir1248}
}