@misc{indiciaeb8ead76ad7d1,
  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 i},
  year = {1915},
  url = {https://www.biodiversitylibrary.org/page/17671753},
  note = {Source identifier: page-17671753}
}