@misc{indiciae731339c4b7cd,
  title = {Spectrographic analyses of insoluble-residue samples, Harrison 1 degree x 2 degrees quadrangle, Missouri and Arkansas : drill holes nos. 55, 56, 57, and 58},
  author = {Barbara Chazin and M. S. Erickson},
  year = {1988},
  doi = {10.3133/ofr88447},
  url = {https://pubs.usgs.gov/publication/ofr88447},
  note = {Source identifier: ofr88447}
}