@misc{indiciaec74437ef3e81,
  title = {Geological Survey professional paper},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1949},
  doi = {10.3133/24978},
  url = {https://pubs.usgs.gov/publication/24978},
  note = {Source identifier: 24978}
}