@misc{indiciae9bf32dbbf203,
  title = {Spectrographic analyses of insoluble-residue samples in and around the Joplin 1 degree x 2 degrees Quadrangle, Kansas and Missouri; drill hole Nos. 131, 132, and 133},
  author = {J. H. Bullock and H. W. Folger},
  year = {1989},
  doi = {10.3133/ofr89667},
  url = {https://pubs.usgs.gov/publication/ofr89667},
  note = {Source identifier: ofr89667}
}