@misc{indiciaef4ff44a11850,
  title = {Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools; especially adapted to the needs of self-tutored men — Illustration, Page 31},
  year = {1918},
  url = {https://www.biodiversitylibrary.org/page/17417919},
  note = {Source identifier: page-17417919}
}