@misc{indiciaef9ff587f6fa0,
  title = {Leasable mineral and waterpower land classification map of the Sterling 1° x 2° quadrangle, Colorado, Nebraska, and Kansas: Lands withdrawn, classified and prospectively valuable for leasable minerals; occurrences of other selected minerals; and lands withdrawn or classified for waterpower and reservoir sites},
  author = {Elizabeth G. Allen and T. R. Flot},
  year = {1980},
  doi = {10.3133/i1224},
  url = {https://pubs.usgs.gov/publication/i1224},
  note = {Source identifier: i1224}
}