@misc{indiciae7504267ed59b,
  title = {Industrial mineral resources of the Springfield 1 degree by 2 degrees Quadrangle, Missouri},
  author = {A. W. Rueff},
  year = {1987},
  doi = {10.3133/mf1830f},
  url = {https://pubs.usgs.gov/publication/mf1830F},
  note = {Source identifier: mf1830F}
}