@misc{indiciaed38b5f813da3,
  title = {Spectrographic analyses of insoluble-residue samples, Joplin 1 degree x 2 degrees Quadrangle, Kansas and Missouri; drill hole Nos. 68, 69, and 70},
  author = {J. H. Bullock and H. W. Folger},
  year = {1990},
  doi = {10.3133/ofr9020},
  url = {https://pubs.usgs.gov/publication/ofr9020},
  note = {Source identifier: ofr9020}
}