@misc{indiciae45a735edba2f,
  title = {Thirty-first winter bird-population study. 13. Upland tulip-tree-maple-oak forest},
  author = {C.S. Robbins},
  year = {1979},
  url = {https://pubs.usgs.gov/publication/5220858},
  note = {Source identifier: 5220858}
}