@misc{indiciae8e871127a2d9,
  title = {Fifteenth breeding bird census: Mixed northern hardwood, spruce-fir forest},
  author = {J.B. Cope and M.M. Hensley},
  year = {1951},
  url = {https://pubs.usgs.gov/publication/5220695},
  note = {Source identifier: 5220695}
}