@misc{indiciae8343433a7668,
  title = {Spectrographic and chemical analyses of exposed Precambrian rocks, Rolla 1° x 2° quadrangle, Missouri},
  author = {Walden P. Pratt and S. K. Odland and A.E. Hubert and D. F. Siems and J.G. Viets},
  year = {1980},
  doi = {10.3133/ofr8025},
  url = {https://pubs.usgs.gov/publication/ofr8025},
  note = {Source identifier: ofr8025}
}