@misc{indiciae4e4763bde8c2,
  title = {Direct-current arc and alternating-current spark emission spectrographic field methods for the semiquantitative analysis of geologic materials},
  author = {D. J. Grimes and A. P. Marranzino},
  year = {1968},
  doi = {10.3133/cir591},
  url = {https://pubs.usgs.gov/publication/cir591},
  note = {Source identifier: cir591}
}