@misc{indiciae9bcd20325cef,
  title = {Spectrographic analyses of insoluble-residue samples, Harrison 1 degree x 2 degrees quadrangle, Missouri and Arkansas : drill holes nos. 59, 60, 61, and 63},
  author = {Barbara Chazin and M. S. Erickson},
  year = {1988},
  doi = {10.3133/ofr88444},
  url = {https://pubs.usgs.gov/publication/ofr88444},
  note = {Source identifier: ofr88444}
}