@misc{indiciae54c8f3689533,
  title = {Spectrographic analyses of insoluble-residue samples, Harrison 1 degree by 2 degrees Quadrangle, Missouri and Arkansas; drill holes nos. 16, 17, and 20},
  author = {Barbara Chazin and M. S. Erickson},
  year = {1987},
  doi = {10.3133/ofr87654},
  url = {https://pubs.usgs.gov/publication/ofr87654},
  note = {Source identifier: ofr87654}
}