@misc{indiciaee7ce496ebe1d,
  title = {A knowledge-based design for geologic learning systems},
  author = {L. B. Fischer and M. Bruntz},
  year = {1986},
  doi = {10.3133/ofr86290},
  url = {https://pubs.usgs.gov/publication/ofr86290},
  note = {Source identifier: ofr86290}
}