@misc{indiciae9a7a5a7dedd5,
  title = {Spectrographic analyses of insoluble-residue samples, Harrison 1 degree x 2 degrees Quadrangle, Missouri and Arkansas; drill holes nos. 50, 51, 52, 53 and 54},
  author = {Barbara Chazin and M. S. Erickson},
  year = {1988},
  doi = {10.3133/ofr88407},
  url = {https://pubs.usgs.gov/publication/ofr88407},
  note = {Source identifier: ofr88407}
}