@misc{indiciae9ad874ff2f7a,
  title = {Geophagy by yellowstone grizzly bears},
  author = {D.J. Mattson and G.I. Green and R. Swalley},
  year = {1999},
  url = {https://pubs.usgs.gov/publication/70035162},
  note = {Source identifier: 70035162}
}