@misc{indiciaeb3be5c908d33,
  title = {Rules for railway location and construction used on the northern pacific railway. With an additional chapter on estimating overhaul in earthwork — Illustration, Page 18},
  year = {1903},
  url = {https://www.biodiversitylibrary.org/page/17818521},
  note = {Source identifier: page-17818521}
}