@misc{indiciae40080ba6ee3c,
  title = {Spectrographic and chemical analyses of whole-rock and insoluble-residue samples, Rolla 1 degrees by 2 degrees quadrangle, Missouri; drill holes No. 55 and 56},
  author = {J.G. Viets and Elwin L. Mosier and M. S. Erickson and S.K. McDanal},
  year = {1979},
  doi = {10.3133/ofr791558},
  url = {https://pubs.usgs.gov/publication/ofr791558},
  note = {Source identifier: ofr791558}
}