@misc{indiciae145f9a5c5027,
  title = {25th winter bird-population study. 9. Upland tulip-tree--maple--oak forest},
  author = {C.S. Robbins},
  year = {1972},
  url = {https://pubs.usgs.gov/publication/5222208},
  note = {Source identifier: 5222208}
}