@misc{indiciae0d90fdd630bf,
  title = {Composition of gallstones from the Denver, Colorado, area},
  author = {Richard W. White and J.R. Tkach and Jon J. Connor},
  year = {1977},
  doi = {10.3133/ofr77570},
  url = {https://pubs.usgs.gov/publication/ofr77570},
  note = {Source identifier: ofr77570}
}