@misc{indiciae3c0661509ba5,
  title = {Preliminary geologic map of Cenozoic deposits of Copperopolis quadrangle, California},
  author = {J. Alan Bartow and D. E. Marchand and Susan Shipley},
  year = {1981},
  doi = {10.3133/ofr811048},
  url = {https://pubs.usgs.gov/publication/ofr811048},
  note = {Source identifier: ofr811048}
}