@misc{indiciaea5d7e49a50c2,
  title = {Ground-water flow direction, water quality, recharge sources, and age, Great Sand Dunes National Monument, south-central Colorado},
  author = {Michael G. Rupert and Niel Plummer},
  year = {2004},
  doi = {10.3133/sir20045027},
  url = {https://pubs.usgs.gov/publication/sir20045027},
  note = {Source identifier: sir20045027}
}