@misc{indiciae93222fc80a96,
  title = {Karst database development in Minnesota: Design and data assembly},
  author = {Y. Gao and E.C. Alexander and R.G. Tipping},
  year = {2005},
  doi = {10.1007/s00254-005-1240-3},
  url = {https://pubs.usgs.gov/publication/70029661},
  note = {Source identifier: 70029661}
}