@misc{indiciaeef1600eaa60f,
  title = {Karst mapping in the United States: Past, present and future},
  author = {David J. Weary and Daniel H. Doctor},
  year = {2015},
  doi = {10.1130/2015.2516(04)},
  url = {https://pubs.usgs.gov/publication/70159678},
  note = {Source identifier: 70159678}
}