@misc{indiciaef8ad14f41d73,
  title = {Core index, a numerical core-logging procedure for estimating rock quality},
  author = {John R. Ege},
  year = {1987},
  doi = {10.3133/cir954},
  url = {https://pubs.usgs.gov/publication/cir954},
  note = {Source identifier: cir954}
}