@misc{indiciaec5efbc5656fa,
  title = {Spectrographic analyses of insoluble-residue samples, within and adjacent to the Joplin 1 degree x 2 degrees Quadrangle, Missouri and Kansas; drill hole Nos. 109, 110, and 111},
  author = {J. H. Bullock and H. W. Folger},
  year = {1990},
  doi = {10.3133/ofr905},
  url = {https://pubs.usgs.gov/publication/ofr905},
  note = {Source identifier: ofr905}
}