@misc{indiciae05d554283060,
  title = {Spectrographic analyses of insoluble-residue samples, Harrison 1 degree x 2 degreesQuadrangle, Missouri and Arkansas; drill holes nos. 4, 5, and 6},
  author = {M. S. Erickson and Barbara Chazin},
  year = {1987},
  doi = {10.3133/ofr87522},
  url = {https://pubs.usgs.gov/publication/ofr87522},
  note = {Source identifier: ofr87522}
}