@misc{indiciae07241015c38b,
  title = {Spectrographic and chemical analyses of whole-rock and insoluble-residue samples, Rolla 1 degrees by 2 degrees quadrangle, Missouri; drill hole No. 21},
  author = {E. L. Mosier and J.G. Viets and M. S. Erickson and S.K. McDanal},
  year = {1979},
  doi = {10.3133/ofr79364k},
  url = {https://pubs.usgs.gov/publication/ofr79364K},
  note = {Source identifier: ofr79364K}
}