@misc{indiciae73f033d1ac3f,
  title = {Leasable mineral and waterpower land classification map, Greeley quadrangle, Colorado, Wyoming: Showing lands withdrawn, classified, and valuable prospectively for leasable minerals and occurrences of other selected minerals, lands withdrawn or classified for waterpower and reservoir sites},
  author = {Henry L. Smith and R. D. Hettinger and Gale Alex Lutz},
  year = {1976},
  doi = {10.3133/ofr76175},
  url = {https://pubs.usgs.gov/publication/ofr76175},
  note = {Source identifier: ofr76175}
}