@misc{indiciae7c0294615420,
  title = {Triangulation and primary traverse, 1916-1918},
  author = {Claude Hale Birdseye},
  year = {1923},
  doi = {10.3133/b709},
  url = {https://pubs.usgs.gov/publication/b709},
  note = {Source identifier: b709}
}