@misc{indiciaefc45c89a1832,
  title = {Spectrographic analyses of insoluble-residue samples, Joplin 1 degree x 2 degrees Quadrangle, Missouri and Kansas; drill hole Nos. 49 and 51},
  author = {J. H. Bullock and H. A. Whitney},
  year = {1989},
  doi = {10.3133/ofr89499},
  url = {https://pubs.usgs.gov/publication/ofr89499},
  note = {Source identifier: ofr89499}
}