@misc{indiciaed0fb41e605fd,
  title = {Metro manual, a hand book for engineers; containing technical information regarding the construction, adjustment and use of transits, tachymeters, theodolites, alidades levels, etc — Illustration, Page 137},
  year = {1915},
  url = {https://www.biodiversitylibrary.org/page/17671686},
  note = {Source identifier: page-17671686}
}