@misc{indiciae50f447758fde,
  title = {Eleventh breeding-bird census. 22. Virgin central hardwood deciduous forest},
  author = {R. E. Stewart and C.S. Robbins},
  year = {1947},
  url = {https://pubs.usgs.gov/publication/5220110},
  note = {Source identifier: 5220110}
}