@misc{indiciaef98e2c424c72,
  title = {Spectrographic analyses of insoluble-residue samples, Harrison 1 degree by 2 degrees Quadrangle, Missouri and Arkansas; drill holes nos. 11, 12, and 14},
  author = {M. S. Erickson and Barbara Chazin},
  year = {1987},
  doi = {10.3133/ofr87520},
  url = {https://pubs.usgs.gov/publication/ofr87520},
  note = {Source identifier: ofr87520}
}