@misc{indiciae2148ffbef3de,
  title = {An atomic-absorption method for the determination of gold in large samples of geologic materials},
  author = {Gordon H. VanSickle and Hubert William Lakin},
  year = {1968},
  doi = {10.3133/cir561},
  url = {https://pubs.usgs.gov/publication/cir561},
  note = {Source identifier: cir561}
}