@misc{indiciae223a7eee0b3f,
  title = {Extirpations of grizzly bears in the contiguous United States of America, 1850-2000},
  author = {David J. Mattson and Troy Merrill},
  year = {2002},
  url = {https://pubs.usgs.gov/publication/1016173},
  note = {Source identifier: 1016173}
}