@misc{indiciaec2a3991123ac,
  title = {Compilation of Regional Ground-Water Divides for Principal Aquifers Corresponding to the Great Lakes Basin, United States},
  author = {R. A. Sheets and L.A. Simonson},
  year = {2006},
  doi = {10.3133/sir20065102},
  url = {https://pubs.usgs.gov/publication/sir20065102},
  note = {Source identifier: sir20065102}
}