@misc{indiciaed64f99c0846a,
  title = {Possible use of wolf, Canis lupus, den over several centuries},
  author = {L.D. Mech and J.M. Packard},
  year = {1990},
  url = {https://pubs.usgs.gov/publication/5223834},
  note = {Source identifier: 5223834}
}