@misc{indiciaecc1994fc6c42,
  title = {Leasable mineral and waterpower land classification map of the Sterling Quadrangle, Colorado, Nebraska, Kansas},
  author = {Elizabeth G. Allen and Terry R. Flot},
  year = {1978},
  doi = {10.3133/ofr77856},
  url = {https://pubs.usgs.gov/publication/ofr77856},
  note = {Source identifier: ofr77856}
}