@misc{indiciaeeb7a60e5493e,
  title = {The seventy-third Christmas bird count. [Untitled. Summary for Delaware, Maryland, District of Columbia, and Virginia]},
  author = {D. Bystrak},
  year = {1973},
  url = {https://pubs.usgs.gov/publication/5222913},
  note = {Source identifier: 5222913}
}