@misc{indiciae964da6613831,
  title = {Terrain diagrams in isometric projection – Simplified},
  author = {J.R. Stacy},
  year = {1958},
  doi = {10.1111/j.1467-8306.1958.tb01577.x},
  url = {https://pubs.usgs.gov/publication/70211899},
  note = {Source identifier: 70211899}
}