@misc{indiciaeda0a571d66ef,
  title = {Letters sent by the United States Geological Survey, 1879-1895},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1949},
  doi = {10.3133/1480},
  url = {https://pubs.usgs.gov/publication/1480},
  note = {Source identifier: 1480}
}