@misc{indiciaecfea089d776c,
  title = {Maps of Helena and East Helena quadrangles, Montana, showing areal distribution of surficial deposits and bedrock and location of geological faults},
  author = {Robert George Schmidt},
  year = {1977},
  doi = {10.3133/ofr77129},
  url = {https://pubs.usgs.gov/publication/ofr77129},
  note = {Source identifier: ofr77129}
}