@misc{indiciaeec20747800c8,
  title = {Spectrographic analyses of insoluble-residue samples, Joplin 1 degree x 2 degrees Quadrangle, Kansas and Missouri; drill hole Nos. 46, 47 and 48},
  author = {J. H. Bullock and H. A. Whitney},
  year = {1989},
  doi = {10.3133/ofr89558},
  url = {https://pubs.usgs.gov/publication/ofr89558},
  note = {Source identifier: ofr89558}
}