@misc{indiciae36c9fb5ced2a,
  title = {Results of sample analysis of heavy-mineral deposits in the Point Lookout sandstone, southwest Colorado and northwest New Mexico},
  author = {R. S. Zech and Isabelle Brownfield},
  year = {1990},
  doi = {10.3133/ofr9040},
  url = {https://pubs.usgs.gov/publication/ofr9040},
  note = {Source identifier: ofr9040}
}