@misc{indiciaef61ea626fc69,
  title = {Railroad, highway, and water transportation systems, 1974},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1977},
  doi = {10.3133/32551},
  url = {https://pubs.usgs.gov/publication/32551},
  note = {Source identifier: 32551}
}