@misc{indiciae47179f96ea9d,
  title = {Isometric block diagrams in mining geology},
  author = {W. D. Johnston and Thomas B. Nolan},
  year = {1937},
  doi = {10.2113/gsecongeo.32.5.550},
  url = {https://pubs.usgs.gov/publication/70212726},
  note = {Source identifier: 70212726}
}