@misc{indiciaee043217bad30,
  title = {Fortieth breeding bird census. 169. Mature tulip-tree - oak forest},
  author = {B. Whitcomb and D. Bystrak and R. Whitcomb},
  year = {1977},
  url = {https://pubs.usgs.gov/publication/5223009},
  note = {Source identifier: 5223009}
}