@misc{indiciaed3715e601815,
  title = {Geologic application of the Interactive Surface Modeling Program (ISM)},
  author = {N.K. Gardner and M.D. Carter},
  year = {1986},
  doi = {10.3133/ofr8687},
  url = {https://pubs.usgs.gov/publication/ofr8687},
  note = {Source identifier: ofr8687}
}