@misc{indiciaefa8210490ff4,
  title = {Topographic instructions of the United States Geological Survey. Triangulation},
  author = {E. M. Douglas},
  year = {1928},
  doi = {10.3133/b788b},
  url = {https://pubs.usgs.gov/publication/b788B},
  note = {Source identifier: b788B}
}