@misc{indiciaef5323a9ec2fe,
  title = {Spectrographic analyses of insoluble-residue samples, Joplin 1 degree x 2 degrees Quadrangle, Kansas and Missouri; drill hole Nos. 27, 28, and 29},
  author = {John H. Bullock and Helen A. Whitney},
  year = {1989},
  doi = {10.3133/ofr89278},
  url = {https://pubs.usgs.gov/publication/ofr89278},
  note = {Source identifier: ofr89278}
}