@misc{indiciaea35eb13b1f66,
  title = {A method for creating a three dimensional model from published geologic maps and cross sections},
  author = {Gregory J. Walsh},
  year = {2009},
  doi = {10.3133/ofr20091229},
  url = {https://pubs.usgs.gov/publication/ofr20091229},
  note = {Source identifier: ofr20091229}
}