@misc{indiciae86f57abb9f8c,
  title = {Fortieth breeding bird census. 28. Upland tulip-tree-maple-oak forest},
  author = {C.S. Robbins},
  year = {1977},
  url = {https://pubs.usgs.gov/publication/5220869},
  note = {Source identifier: 5220869}
}