@misc{indiciaec49986372eae,
  title = {Spectrographic analyses of insoluble-residue samples, Joplin 1 degree x 2 degrees Quadrangle, Kansas and Missouri; drill hole Nos. 128, 129, and 130},
  author = {J. H. Bullock and H. W. Folger},
  year = {1989},
  doi = {10.3133/ofr89666},
  url = {https://pubs.usgs.gov/publication/ofr89666},
  note = {Source identifier: ofr89666}
}