@misc{indiciae2865fa6d4db2,
  title = {Apparatus and technique for multiple tests by the confined-spot method of colorimetric analysis: Application to field estimation of nickel and copper},
  author = {J. H. McCarthy and R.E. Stevens},
  year = {1958},
  doi = {10.1021/ac60136a026},
  url = {https://pubs.usgs.gov/publication/70010451},
  note = {Source identifier: 70010451}
}