@misc{indiciae9d41a62214aa,
  title = {Spectrographic and chemical analyses of whole-rock and insoluble-residue samples, Rolla 1 degrees by 2 degrees quadrangle, Missouri; drill hole No. 61},
  author = {E. L. Mosier and B. F. Arbogast and J.G. Erickson and S.K. McDanal},
  year = {1980},
  doi = {10.3133/ofr80394},
  url = {https://pubs.usgs.gov/publication/ofr80394},
  note = {Source identifier: ofr80394}
}