@misc{indiciae6acf8223ea5c,
  title = {Geologic map of the Willows 1:100,000 Quadrangle, California},
  author = {M.C. Blake and E. J. Helley and A. S. Jayko and D. L. Jones and H.N. Ohlin},
  year = {1992},
  doi = {10.3133/ofr92271},
  url = {https://pubs.usgs.gov/publication/ofr92271},
  note = {Source identifier: ofr92271}
}