@misc{indiciae035a23b74f09,
  title = {Digital terrain tapes: user guide},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1980},
  doi = {10.3133/70039443},
  url = {https://pubs.usgs.gov/publication/70039443},
  note = {Source identifier: 70039443}
}