@misc{indiciae0a8c7620082d,
  title = {Technical manual for a UNIX-based device-independent vector graphic system},
  author = {G. I. Evenden},
  year = {1991},
  doi = {10.3133/ofr912},
  url = {https://pubs.usgs.gov/publication/ofr912},
  note = {Source identifier: ofr912}
}