@misc{indiciae44c27dd44fd3,
  title = {Field determination of nanogram quantities of mercury in soils and rocks},
  author = {Margaret Hinkle and Kam Wo Leong and F. N. Ward},
  year = {1965},
  doi = {10.3133/ofr6571},
  url = {https://pubs.usgs.gov/publication/ofr6571},
  note = {Source identifier: ofr6571}
}