@misc{indiciae28641a56ffbf,
  title = {The seventy-fourth Christmas bird count. [Untitled. Summary for Delaware, Maryland, District of Columbia, and Virginia]},
  author = {D.R. Bystrak},
  year = {1974},
  url = {https://pubs.usgs.gov/publication/5222911},
  note = {Source identifier: 5222911}
}