@misc{indiciae81212f7479cc,
  title = {Twenty-ninth winter bird-population study. 13. Upland tulip-tree-maple-oak forest},
  author = {C.S. Robbins},
  year = {1976},
  url = {https://pubs.usgs.gov/publication/5220876},
  note = {Source identifier: 5220876}
}