@misc{indiciae4ec8773fa026,
  title = {Atlas of gull and tern colonies: North Carolina to Key West, Florida},
  author = {John W. Portnoy and R. Michael Erwin and Thomas W. Custer},
  year = {1981},
  url = {https://pubs.usgs.gov/publication/fwsobs80\_05},
  note = {Source identifier: fwsobs80\_05}
}