@misc{indiciae52803fe51f16,
  title = {Thirty-seventh breeding-bird census. 15. Upland tulip-tree-maple-oak forest},
  author = {C.S. Robbins},
  year = {1973},
  url = {https://pubs.usgs.gov/publication/5220892},
  note = {Source identifier: 5220892}
}