@misc{indiciae72e6cdff3347,
  title = {Preliminary geologic map and coal deposits of the southwest quarter of the Nipple Butte quadrangle, Kane County, Utah, and Coconino County, Arizona},
  author = {H.A. Waldrop and Robert L. Sutton},
  year = {1966},
  doi = {10.3133/ofr66150},
  url = {https://pubs.usgs.gov/publication/ofr66150},
  note = {Source identifier: ofr66150}
}