@misc{indiciae060fccba20c1,
  title = {Spectrographic analyses of insoluble-residue samples, Harrison 1 degree x 2 degrees Quadrangle, Missouri and Arkansas; drill holes nos. A7, 13, and 44},
  author = {M. S. Erickson and Barbara Chazin},
  year = {1987},
  doi = {10.3133/ofr87518},
  url = {https://pubs.usgs.gov/publication/ofr87518},
  note = {Source identifier: ofr87518}
}