@misc{indiciae29393acfe016,
  title = {Spectrographic analyses of insoluble-residue samples, Joplin 1 degree x 2 degrees Quadrangle, Kansas and Missouri; drill hole Nos. 43, 44, and 45},
  author = {John H. Bullock and Helen A. Whitney},
  year = {1989},
  doi = {10.3133/ofr89281},
  url = {https://pubs.usgs.gov/publication/ofr89281},
  note = {Source identifier: ofr89281}
}